It's commendable you're so concerned, assuming your motive is establishing your skill in a pure way and not just trying to shrudely appeal to a certain group. The only "group" that understands pixel art for what is are pixel artists themselves, and they're pretty rare. Vast majority of your player audience has no idea what they're looking at, they don't know pixel art's in's and out's.
Isn't it crazy working at the pixel level all of the sudden? You just threw yourself into pixelling recently I assume. For a digi painter, it must feel odd. Before doing pixels, just taking for granted things like anti-aliasing, etc, it was quite a transition for me. And I'm still figuring out just what pixel art is. Trouble is, there isn't one applicable definition. But, that's art for ya. You just have to figure it out for yourlself.
More on yer scene - it's composition is nifty, that boulder establishes a welcoming asymmetry with the tree and human figure. This pixelling style begins to remind me
Buloght's on Pixel Joint. I assume you've found Pixel Joint already, but if not you have many hours of browsing, open-jawed, if you haven't. Hit up the Hall of Fame gallery there.
I love the dynamic overall twisting turn our vantage point creates, the way the scene almost feels to be getting sucked into the bottom left corner. So much funner to look at than a typical flat horizon. Thought about attempting some more defined wispy cirrus cloud texturing in the sky, rather than the broken up grainy detail, which I think still works alright.
Maybe some stronger evidence of light hitting the tree's left side for more realism; would be mostly visible on the thickest/roundest part of the tree. Some branches get thin then thicker, that doesn't seem quite right.