So hard <.<

[Chyness Profile]

So heres the thing i've been drawing people in the last couple of months with no problem ( most of the times ) but now i want to draw my sister but its like i cant transmit her smile to the papper im stuck i dont know what i can do or what techniques i could use. ( Sory for my english ) Picture -> http://prntscr.com/4v0kyf