Great photo. Beautiful tones and colors. Nicely in focus. And a surprise to see such a small creature so up close.
Darkness. My very first impression was that it was too dark. I think boosting the levels - selectively if necessary to preserve the black background - would have helped your score quite a bit. There is allot of beautiful tone and texture in the brown fur and whiskers and boosting the levels would allow these to 'pop'.
Composition. That big black eyeball is great. But it is almost centered. A different crop that put that eye on the thirds line would make this stronger. Probably cropping from the top and cropping from the left so you preserve those great whiskers. If you could get those whiskers to really jump out, you would have a very strong photo.
A sweet shot of this little guy! And here I didn't even notice the title error - I thought there was such a thing as a Agouti Gebril and that it was Italian or something.
How nice to see one of our rodent friends. Pocket Pets Rule! Pretty little thing; nice textures, good clarity. I think the Sharpen filter would have brought out the highlights in the fur a little more.