The rendering style is lovely! Beautiful color and texture in this and I love how you've laid it out.
For me I am not very attracted to the face of the caterpillar. But the colors are really great on him. I wonder if the leaf in front of him could be brighter so we see he is going for it. The sun coming through more.
One other thing is it doesn't look like he is following the path of the vie very well, and it leaves it feeling flat.

Hope that helps!This is a great piece, and I love this style! After sticking with it (if it's what you love) you'll be a lot faster and won't feel quite as daunting!