Hmm, your sprites are interesting, but if you wanna improve you need to blend a tad more, maybe work on how you position the body parts, they look cut 'n' pastey. try Scratching the parts,
Your last two are good. Although the beak doesn't look connected. And like Aqua Charlie said, don't copy and paste. Not all pokemon parts are compatible with all pokemon. For example the left wing on the Charmander/Flygon doesn't look right.