First off, dave them in PNG ALWAYS. JPG is ONLY, ONLY, ONLY FOR PICTURES.
Second of all, they are very good recolours. However, the Ledyba is bugging me. What the heck is that glowing outline surrounding it? I can swear I see an outline. Is it supposed to be glowing or something? I'd like to know. Also, Gastly's eyes look sorta weird as if the shading is a tiny bit off, but I'm not sure.
Very good job. Just NEVER save sprites in JPG.
Also, you made two boards of the same topic. I'd recommend you to go delete the other one pronto.