To make the background less hard to read make sure no strong lines converge on the same points. Make the elements in further back layers at the same time simpler and smaller and just make sure they don't line up. Therefore the hard blue bush layer should have the most meticulously contoured and biggest bushes, the one behind it should be smaller, lower and simpler, and the one on the far back should probably by stylized light coming through the holes in a busy forest. Right now you're going in reverse, closest tree is smallest and the ones in the back get exponentially bigger and light up in unattractive places.