Ailelulu nice fusions of Psyduck, they look pretty awesome. The only one I don't really like is Gyaraduck, it looks really...strange xD.
Mordock that sounds good, just need one or two more opinions then we can start getting this approved ! :D. Thanks for your opinion as well Agaki.
Alchemator, for a first fusion that is pretty good, but I have a few suggestions.
NEVER save as a JPEG or JPG, it reduces quality. Always save as a PNG.
The outline looks really inconsistent, make sure that it remains consistent.
It also looks like you scratched a part of his tail. Always remember to shade the parts you scratch, and to have an outline that matches the sprite (lighter shades of the outline where the light is hitting, darker shades and black where the light is not hitting). For Pokemon sprites the light source is mostly from the top left, so use that as a reference for shading.
Other than that, good job dude! Glad to see more people getting into spriting ^^).