I quite like it. You can really see how it's formed. The technique is cool, like using a sponge for implying leaves. It's a trick I've used before too, back when I was more playful. Sponges have a definite use with certain types of painting, especially when other uncommon tools are used to make unique marks. I think it works well with your rocks too. This piece is very successful.
The only thing I would recommend at this point, since you're getting good, is when you want to feature something, as in this case the tree (I assume) to think in terms of composition and lighting and leading the viewer's eye. This composition is perfectly fine. But there are many ways to organize the shapes on your canvas between relative sizes, shapes that frame and/or point to your key element. Remember, create a hierarchy. Know your 'star' of your picture and have everything else serving the attention going to that. It can be subtle or obvious. That's up to you as the artist.
A great way is to look at some of the staging that exist in paintings. Google Images is a great resource for seeing at a glance things that have been done.
I'm very impressed to see how you've expanded your artistic range. Go Rondo Go!
"Not a bit is wasted and the best is yet to come. . ." -- remembered from a dream