Id say u should be more assertive and display more confidence. Instead of "Do u think I could get ur number and text u sometime?" say something like "I would like to get to know you, and if you feel the same, here's my number"....otherwise you're coming off as asking her permission which she may interpret as weakness. So you're giving her a choice (taking a little bit of pressure of you) and making your intentions clear as day. I think thats better but then again, im not exactly a certified yambologist so take it how you see fit.
I don't know if it's just my perspective, but chasing off pure physical attraction comes off as (for lack of a better word) desperate to me.
-even if you do it so subtly like how you did it. because if she has standards, shes not giving her number to just any good looking brother.
you have to bring something more to the table, besides confidence.
the way I generally go about things, is I have an actual conversation.
-because it then shows you are articulate enough to have one, and your judging them more then appearance, and that your standards
mean something. (women love to be validated by a man who has standards, let them prove themselves to you)
-if the convo goes smooth, then get the #
-if not, be polite, be about your way...let it marinate, if you happen to run into 'em again, have something to build off of.
at least from my perspective.