There is much texture details, but imho too little contrast, making the whole character hard to look at. Contrast is a great way to add volume, too. And at some places (esp. the front arm), you could definitely use more detailed volume, with a clearer lightsource.
That could be sketched on a flat-color copy of your picture first, imho, so that you can try several combinations before blending them into the final picture.
Don't hesitate to make those vines-stuff (greens) swirl more to give them a more organic look.