I like the Bulbasaur line recolours, but for some reason, the colors seem a tad bit bright. May be just me eyes...
The Flannery is probably my favorite, you did a fairly decent job of fixing it up.
Dewgong is okay, but there is a little too much of a color difference on the medium blue and the dark blue on it's body. Same with Gyarados, but Gyara's colors seem a bit too vivid for my liking. Vileplume is good, but the outlines on it's body need to be recoloured as well; don't forget that.
Very good job overall. More work, and you'll be a great spriter!
~?HR?