Help with my sprites?

[WonderPup]

Now it looks like he has tumours on his arms. Muscles aren't just ovals stuck on your arm with no depth to them, either get rid of them or try using shading to show them rather than an outline.

The only time it appears to be an outline is when there is an arm being brought to the front. During the "standing" frame, the muscles are shaded. When an arm is in the background, you can't even observe the bicep at all.

Do others feel the same way about it? If so, I may introduce a fourth color for the skin.