Nah, don't worry about it, good attempt on the trees >.< it's hard to replicate their texture. Perhaps you shouldn't have used such a thick outline- makes it look a bit blocky. The trunks also look a little strange, maybe it's just me, but the shade of brown doesn't seem ... right (?)
Love the girl, just one tiny complaint. Can't really pin what it is, but her arm seems a bit too thin, and the placement seems slightly out.
But yes, well done ^_^ looks fab. Thanks for sharing.