you've done a pretty good job of emulating the style and colors.
rough edit, mostly for structure:
first thing that immediately struck me was his balance. he seems very wobbly, very close to tipping over. given the tail, he's got a lot of weight in the back, and with the structure of the legs and placement of the head so far back, it feels like he's going to fall over backwards. so i tried to counter the weight of the tail by having him lean forward a bit to support it (I feel this also creates a more natural flow for the spine/neck). second major concern was the legs- I'm not quite sure how they attack to the body. I think emphasizing that zig zag bend (elite legs, if you're familiar with Halo) would be useful, and as buddy said, making them less spindly will make the character more stable. I also widened his shoulders, as I felt his chest was being compressed into a small area. finally, i enlarged the far eye and moved it down, as the head is pretty level and that eye is a bit too small and also floating off.
color wise, the green highlight felt a little too saturated to work with the rest of the palette. I also made one of the purples a little more bluish just to add some variety to the purple ramp
my edit could probably be much more dramatic, but i'm pretty wary of making edits that stray too far from the original, especially if it's influenced by my work/style, I wouldn't want steer yours toward a carbon copy of my work or anything like that.