 
- Don't look closed off by crossing your arms (even if it feels comfortable).
- Overdoing it on the head nod will make it seem like you're disinterested.
- Make the effort to lean toward her. It shows you're interested.
"Although you can't fake a connection with someone, you can definitely enhance it by trying to get on their wavelength. "                 
First dates  are all about seeing whether or not you and the woman you’ve asked out  are in sync. You might pay special attention to what you say (which is a  good thing), to how you clean yourself up (big bonus) and to any sparks  that fly over the dinner table. But don’t fall into the trap of letting  your body language mess things up for you. Here are 10 first date body-language mistakes to keep out of her sight. 
Pointing your feet away from her
When we like something, our bodies instinctively want to move closer to  it. It happens subconsciously a lot of the time, but be aware of your  feet. Are they pointing in her direction or at a hot girl at the bar? Be  sure that they’re facing the woman you’re on a date with, as this is  positive body language that shows her you’re interested. 
Patting her during a hug
A hug at the end of the date is a great way to show her you want to touch her (and women want to be touched),  but don’t pat her on the back. Although this could happen when you feel  a bit nervous or you don’t want her to think you’re jumping her, the  back pat gives her the idea that you are uncomfortable getting closer to  her or that you just don’t want to make contact. Yes, it’s that bad.  Always lean toward her when you reach in, and if you don’t want to come  on too strong, make it a short hug. 
Moving too quickly
You might not realize that your body often mirrors your internal  emotional world. If you’re feeling a bit nervous about the first date,  it could be reflected in your body language, such as make fast movements  while talking or eating. This first date body-language mistake tells  her you’re nervous and maybe even insecure. The impression you want to  make is that you’re calm, collected and confident. So become more aware  of your body and try to slow down your movements. 
Nodding too much
If you nod a lot while your date is speaking, she’s going to think  you’re not really listening or you just want her to wrap up what she’s  rambling on about so that you can take the stage again. Basically, it  tells her you’re not interested in what she has to say. Of course,  nodding a little bit can be good because it shows that you agree with  certain things she says, but keep it to a minimum.
Speaking out of sync
Mirroring each other on a first date creates the impression of being on  the same wavelength. Pay attention not only to what your bodies are  doing but also to how your speech patterns match. If she speaks really  fast and you’re more mellow, for example, it throws you out of sync. Try  to match her, as this will make your conversation flow. Although you  can’t fake a connection with someone, you can definitely enhance it by  trying to get on their wavelength. 
She might even think that you're just bored of her company and it's causing you to shred those napkins. "
Crossing your arms
Maybe crossing your arms is just a stance you feel comfortable in, but  it will make your date feel that you are literally closing yourself off  from her, which explains why this makes our list of first date body language  mistakes. That’s never going to make her feel warm and fuzzy inside on a  first date. Try to keep your arms extended or open as much as you can  so that you show her you are willing to engage in conversation. 
Invading her space
Sometimes instead of blocking yourself off from your date, you end up  being a little too engaging. You might move too closely to her so that  you’re breathing the same puff of air. Although you think she might have  been flirting with you or sending you signals for you to move closer,  it’s too soon. Plus, even if you’re charming and she’s showing interest,  if you’re invading her personal space, you risk it being seen as an instant turnoff.  
Fiddling around
Fiddling with objects or not being able to stay still could be seen as  displaying nervousness, a lack of confidence or disinterest. She might  even think that you’re just bored of her company and it’s causing you to  shred those napkins. Try to remain still and focus on your date.  Immerse yourself in the moment and show genuine interest. Keep still and  don’t fiddle, so that your confidence speaks for itself. 
Intense eye contact
Eye contact is always a must when it comes to displaying good body  language on a date, but don’t think that this means you should laser  into her eyes. Can you say creepy? It will make her uncomfortable or  cause her to feel like she’s being scrutinized by you. Let your eyes  meet across the candlelight -- but not for longer than a few seconds so  it’s not awkward. Do not turn her off with this first date body language  mistake.
Touching her
Perhaps you’ve been laughing, enjoying some drinks and giving each other  a lot of flirtatious looks, so it’s only natural to think that it’s OK  to reach over and touch her. Don’t! You might be coming on a little too  strongly for a first date, and she’ll likely assume that you’re only  interested in her for sex.  The only time it’s OK to touch her is if she touched you first, like if  she has brushed your arm during a joke. In that case, she’s giving you  the go-ahead and hoping you mirror her actions.

First Date Body-Language Mistakes