Custom U.B Funkeys

[U.B.Funkey]

I dunno what these are, but anyway..

Made my own to show you what to improve.
1. Lineart. Make it less jaggy and more round. Fairly easy since they are basically made up of a bunch of spheres (circles in lineart)
2. Shading. Yours had none. Or maybe it had, but it needs more contrast (contrast is the difference between shades, aka darker shadows and lighter highlights).
3. Look at your reference. Smaller eyes, the rainbow on his face should not touch his left ear. The rainbow on the lower right of his body should't curve in that direction. I changed all these in mine.

Mine was rushed, so it still can do with improving.
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Thanks.I'll work on the shading,but for now:

Update 2:

Sprout:

Tails(Fake):