love the lighting and the texture of the rocks! if i can make a suggestion, i think adjusting your light source or the brightness of the shadows can help push the composition! the shadows and the dark colors of the tree are too similar in value, so when viewed from far away, they sort of blur together and we lose some clarity over what the trees look like. it would also help them stand out more since they're already in front of a white background (the wall). adding a sky could also help the leftmost tree stand out, since the leaves get a little lost in the darkness of the background as well. very nice work! 

not too bad! I am not sure about the theme and i feel like the wall doesn't really make sense: I think the bricks should be alternating usually (I'm not a mason though idk)? I do like the trees though, how did you do those?