Good composition and placement of the log. You have the squirrel elevated on that log and creating the image at his level adds dramatic impact.I would suggest that much of the top can be cropped as it is negative space and not contributing to the image. The brown spike did not catch my eye but you could easily clone that out. I would also crop a bit of the right and bring that log's edge right into the lower right corner.
It looks a little dark so perhaps brighten it up a bit. Nice capture of the action and placement of the tail. the expression is priceless. Good work creating this strong image.
A very different looking squirrel. Like the comp.You have a real nice BG. Overall the image is a bit dark... A bit more negative space on top than needed but I don't mind it,, Great expression on the face..