It’s incredibly hard and futile to critique very stylized works like this, because it’s so subjective. Almost anything can be chalked up to “style,” and nothing can ever be wrong. About the only thing to judge would be the composition and colors. Both seem fine in the first one. In the second one, there could be a bit more breathing room on the right, since right now the weight of the composition is shifted towards the right. A dead center composition is usually kind of boring unless it’s a very iconic type of subject matter (like a portrait). I would suggest maybe making this a landscape orientation, with the tree placed at 1/3 to the left, and then have something else counter-balance on the right.