It looks like there is a little texturing problem on the side. The texture looks defined in the middle pare of the saddle, then seems to be a little stretched by the top and bottom.

I think a darker leather brown would go with the green instead of the blue.

For the animals color, I think a weak chroma/value red would look cool on it Or even better would be that blue and purple texture on the inside of the saddle.

I like the design of the creature something about it seems like an earlier generation fantasy style.