What body language do you display, to tell a girl she has a positive effect on you?

[Deknife]

When a girl sees me and she immediately takes a quick breath and fixes her posture and smiles giddily to herself, it tells me she's happy/excited to see me. That has a strong effect on me, I see I have a positive effect on her.

But body language should a guy display when he sees a girl enter the room to tell her his spirit is lifted when he sees her?

 

[oneboy21]

Smile.
Take courage and go talk to her.

 

[Elephant]

What oneboy said, and make eye contact.

 

[oneboy21]

Watch for this sign too
Look in or look away
if she looks down, you can go talk to her
If she looks away she is not interested in you. If she scratches her face or scratches her eye, she isn't interested.
Also Don't break the eye contact until they break it. Straightly look into her eyes and smile.

 

[Chamber36]

From my experience the best body language to show that you're interested is turning toward them, leaning forward and tilting your head sideways to a 60 degree angle.

If she scratches her nose it means she likes what she sees. If she scratches here eyes it's a no-go. Most likely she will just run away though.

All you have to do is be welcoming.

 

[Aaron B]

it's better if she wonders how you feel about her, as opposed to her having no doubt

 

[Love's Orphan]

I agree with Aaron B. She will wonder, but thats only if she likes you.

 

[Naughty Ninja]

Smile.

hold your head high.

Have good posture.

Be friendly, approachable, and talkative.

Dress well, look clean, smell good.

Pretty simple. If she's still not interested after talking with her. No big deal. No reason to drive yourself insane over it. On to the next.