Wow, this is such a fun piece!
I do have a couple of thoughts. First, I think that the values could be pushed further to really separate the background from the foreground. Second, I think you can harmonize the colors a bit more, thinking in terms of yellow vs purple. So perhaps warm your greens a tad (bringing the more toward yellow) and go a little further with the purple in the shadow areas, and maybe distribute some of that purple onto some of the foliage throughout the piece. As you render the frog, try to make him pop out more, so he has more contrast than the crocodile. I would also think about making the crocodile a bit smaller so she appears to be farther back, just to create visual interest.
Hope you don't mind that I did some adjustments. I lightened the sky and brushed some of the yellow from the sky onto the background elements. Then I put a yellow filter over the whole thing and brushed more purple into the foreground.
Again, really fun piece. You are really cranking them out. Good job!