I thought I would make one thing lower than the other to get the sense of roundness.
The eyes are level, though. The left one should be higher. Just look at the egg shape, minus any of the colours or features. Just the outline. It's tilted to the right. That means the things on the left should be higher. Give a sense of roundness by adding more shading like rabidbaboy just said, and by wrapping things around the edges (as you currently are to an extent).
