EDIT: Ok. I had the urge to post all my new work! So it's not just going to be fusions. It's going to be all of it! So..anyways, it's just my Fakémons.
lol, I had to do the center because if I put Groudon's stomach, it wouldn't fit. So I made one from scratch and tried to copy the stomach. thanks for the comment though.
First of all -
Look at some really experienced spriters to see how to shade.
Then, learn how to custom parts.
Don't use the default Paint colors.
Think of more original ideas for your mixes. Mixing all 3 starters and legendaries = bad.
I can't even tell what the second set is... The colors are blinding, and the lineart is wobbly and thick.