Ok lets start by making one thing very clear. DONT NEG, TEASE, LAUGH or anything like that. She gave you a compliment, she showed interest in you so do you really want to neg her (a push)? No, you want to reward her for helping your interaction escelate.
The best thing to do without being to fancy is a simple "thankyou" with a smile and a touch on the arm. Alternatives could be "thankyou, your just so cute your like my little sister" and then put an arm round her (classic little sister routine). Tbh it doesnt matter what you say, you want to reward her for doing something you like and that re-enforces her liking you.
If your fimilar with the push pull idea when you recive a compliment you want to pull, kino/compliment/etc etc.
As for using your eyes, granny snatcher has things slightly off with saying you shouldnt be showing off but still makes a good point. You dont want to be making a point of having nice eyes, if they are that good girls will notice. HOWEVER, you should be using them to your advantage! Non-verbal things that draw attention to them are great, i also have very attractive eyes and therefore i use lots of eye contact. If there is a slight pause i may just look deep into the womens eyes and possible do a little triangle gazing (right eye, left eye, lips, right eye). This isnt showing off, this is just using something good about you to its full advantage. Showing off is having to say something about it, using it well is letting her notice it herself.
Hope that helps
