Revamps - Very good, finally a spriter who can shade properly!
Pokéballs - Metagross is good, Drapion looks too unconnected to the rest
, sneasel arms look out of place - ear/feather is good, Clefairy is nice and simple
Fusions - first one too crowded, and the outlines aren't strong enough... spiritomb, very plain, no outline
(too much difference to the normal tangrowth) Drapion, Tail outline is too faint, otherwise good. Buizel, nice don't like colours though
Ampharos same as Buizel... Dialga tail looks at an odd angle (though not really much could be done...) Rayquaza, wings don't look too attached... Aggron cool, I would colour the metal dark green... Kakuna nice, though wings look odd
Dragonair, left wing looks like it is the wrong angle (again not really your fault...) Blastoise, nice though the patterning should either continue or not be there at all... Jirachi... looks very odd
Userbars - Nice, I think they could be improved by a border...
Sigs - Nice, they look a bit rough (too much perhaps)
Sorry about all the negativity, I like to post constuctive advice
Also you are very good, I especially like those revamps, as the shading is the key part for G/S/C revamps