Wow, nice work! I feel like you mimicked the original a little too closely, but being able to get this close, especially despite the lack of experience, is impressive on it's own. Most of the things I'm noticing are small things, like how the dirt seems to have a different light source than the trees, or the implied line in the grass. I think you just need a little more experience to see them for yourself, and they're not currently getting in the way of your artwork. Keep learning and practicing, I like this and I'm looking forward to seeing what you do next!