Your sigs are pretty good, but the background in this one attracts more attention than the character. In addition, the upper right corner of the image is a bit choppy. The border could be reduced in size a pixel or two (or completely removed)....at least for this board. Also, his muzzle blends in with the background. I don't think that looks too good honestly. These are all easy things to fix if you kept the project file (which I assume you did, right?).