Custom Koopa

[A.J. Nitro]

Okay, which head placement is better?

[KillerAslox]

Left, looks more natural to me.

[Previous]

Definitely the left one. The right one has its head on his left shoulder rather than on the neck.

The nose looks a bit too flat at the front. Also, something looks off about his feet, they seem to face slightly too far to the left.

[Ridge Troopa]

Left one.

Outside of that issue, move the top of the nose down a pixel. Second, things might look better placed if you shifted everything above the feet up and to the right a bit.

[A.J. Nitro]

Oh, I wasn't planning on continuing this for a while, but I'll keep that in mind if I do.

[CeeY]

The shoes need to be a little smoother.

[balladofwindfishes]

those cheeks have some extreme depth to them, almost too much. I know Koopa's snout dips in like that, but the way you made it, it appears almost like there's a crater there