First impressions: Nice shots - C&C - the bird shots look like they could use just a bit more contrast, or something. they look just a bit flat. As for the squirrel shots, they are a bit too closely cropped IMO. Give them a bit more room to "breathe" so to speak. The last shot has the squirrel centred in the picture - I would have placed him a little more to the right giving him some negative space to look into on the left. As well, the squirrel shots might look better if they had the same "background bokeh" that the bird shots do. HTH.
WesternGuy