Your first picture is adorable! Surskit inside a carved pumpkin is one of the cutest ideas I've seen! ^_^ There's not much I can critique on for this piece other than recommending you make Oshawott's mouth a little smaller, though that's generally a minor issue. I love Wooper's expression and the colors you chose here match very well in my eyes. :3
The second image is also very pretty, though I share the same opinion as Ana on the water; Eevee's brown and the purple of the water are a little hard for me to look at because of clashing colors. ^^; Also, assuming this is regular water, the bodies of the Pokemon should be at least slightly visible when underwater - water is fairly transparent.
I don't have much to critique on your last piece. It's gorgeous, as are the rest of the images. Great job, looking forward to updates! You're very talented. =D