when i first look at this i think, he knows how to draw, that's for sure.
then i let my eye wander and i bump into some things.
the first thing that hit me is that neji's head might be too tilted, it look unnatural to have one's head like that, the second thing is that the scenery is quite lacking in power. I mean, you definitively have the mood in this painting, but it lacks this "je ne sais quoi" that makes it really interesting.
now note that i am not an expert, but i'd still like to tell you my opinion.
one thing for sure is that the trees are not defined enough. That pretty much sucks out all energy from this picture. A bit of defined grass wouldn't be too bad either. And maybe a tad bluer sky (too white)
now now, i don't want to be all criticism, so i'll tell you the good things you did that i liked a lot.
first of all, the shadow sent down from the trees is what really gives this life; and secondly, a quite correct anatomy on the two characters.
great job :)