Very sweet! An unusual shading stye, but it suits them, and the background doesn't detract or disract from the rest of the picture. I love Al's expression, with his huge eyes, and I like the detail of the rocket on the shirt. Also, you have really improved with the hands, and generally I think you are improving a lot. The hat could do with a little more shading. I really like pinky's eyelids, but possibly a little more detail would look good. The detail on Al's collar really stands out, as does the curl at the end of Pinky's hair. Possibly including more details like this would improve the picture? However this is a good style and suits your characters.