Gosh, that was quick!
This little squirrel is so full of character and you have really caught him in a wonderful pose. It is full of life and wonderful the way he is balanced on the twig. It really looks as though he might be about to scamper off the page at any moment.
What I would like to suggest is to work on your pencil technique - to consider a bit more how you use the medium. I wonder whether it would be a good idea to use a much harder pencil? At any rate you need to keep it really, really sharp.
You have got some wonderful directional marks on the tail and it is lovely the way that the pencil is used much lighter along the top edge. This really gives a sense of form of the tail and the hairiness of it. This is really lovely work. However, on the body you seem to have used short, thick strokes of similar length and spacing which does not seem as convincing as fur. You need to find a way of using your pencil to suggest both the texture of fur and the tonal value changes of light and shade - which is not easy! I think that finer lines would help as well as more variety in stroke length and light or darkness based upon your observations of the animal. The best way I can think of to get some tips on how to do this is to look at lots of drawings by other wildlife artists and to ask yourself how they have solved this problem.
Overall, I do think this is a really lovely and characterful drawing. Congratulations.