Girls help me on this one! Any advice?

well i had seen this girl around and i kind of got a little crush on her. anyways, one day like 2 or 3 weeks ago i was starring at her and her friend when they were passing by and she smile at me and i look away because im kind of shy....

so i was sitting on one table in the hallway last week and she was kind next to my table not close but not far away, well i was drawing this actress in one of my portrait and i got a sheet on my hand, anyways she was with her best friend talking and then she got up from her table and came to mine and grab the sheet of paper from my hand then she said that's a really nice drawing or something like that... then she said how long had you been drawing and i reply this is my first semester but im the worst on my class xD......

then she said you draw really good and then she gave me the sheet back and went back to her table with her best friend and her best friend asked her, "what were you guys were talking about?" then she replied to her friend and i couldn't hear what she said...

well to be honest i messed up afterwards when i got up from the table and approach one of my friend which is a girl and talk to her for like 30 sec in front of her.

now this week on Tuesday i try to talk to her and this i how it went... well i found her eating with her friend so i didn't try to talk to her, and i waited until her friend left.