>>1478762The thing I notice that irks me is in the middle of the tail, the dark brown portion isn't correct when compared to the original image. In your image, you have the left most dark spike go all the way up the lighter shade with the same width, but its width is supposed to be half of the lighter shade. The other issue is one of the shadows is supposed to end more bluntly, but that can go up to personal preference. Besides those two issues, I don't really see anything else wrong with it.
Here is a comparison showing what I am talking about.
