Warning : these simple tips come from a hobbyist with no formal art/animation training or experience. Don't take them too seriously.

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Eyes : 3 layers and a face

Movable controllable eyes

Naturally, if you're going cartoony enough, you just use black circles (or ellipses) rather than more complicated eyes

You can make them blink just by scaling them vertically, and translate them around the face.

Tip : Put the eyes in a separate layer to select them more easily, or assign them to a bone

The next most cartoony step is to use simple white eyes with black dots, no eyelids, sitting on top of the face.

You should be able to get a blinking effect by scaling the eyes. Alternatively , you can get a similar effect by scaling the eye layer - to arrange this, make sure you arrange the origin along the horizontal centre-line of the eyes (or wherever you want the eyes to blink closed - you might wish to put the origin slightly below the centre-line of the eyes).

However, this becomes a problem when you move the black dots to the edge of the eye.
It looks a lot better if the dots can slide behind the edge of the eye.

To arrange this we have to make eyeholes in the face shape.

At this point the whites of the eyes, and the pupils/irises, need to be moved below the face level. You may want to move them onto separate layers for easier selection.

What's more, with eyeholes as part of the face, we can no longer use the layer scaling trick to blink the eyes without squashing the whole face. You can, however, just select the eyehole control points and scale them.

Alternatively, you can create separate eyelids - keep them on a level or layer below the face but above the pupils and whites of the eyes.

If you are making separate layers for all these parts, consider collecting them all together under a group layer so as to move and scale them all together..

    Face group
  • Face
  • Eyelids
  • Pupils/irises
  • Eye-white
Each of these sections may itself contain multiple layers, for bones and geometry.
More complex eyes :
Rather than a simple black circle, you can quickly and easily create irises and pupils as simple shapes in Moho.

Tip : To get exactly concentric circles in Moho, just select one circle, copy and paste (Ctrl-C, Ctrl-V), then scale the pasted circle.

Of course, if you're going anime-ish, you may wish to add more detail, such as this simple eye created from 4 circles (one considerably reshaped, one slightly reshaped) and using a gradient fill.

Alternatively you can of course create the pupils and irises (and even the whites) in your favorite paint/drawing program, such as this eye created in the nifty vector illustration program Xara (following a tutorial by Gary W. Priester), or even copy them from photographs, putting them on image layers
Controlling the eyes :

If you're using simple eyes with even movement in a front-on view of a face, you can just attach both sets of pupils/irises to a single bone, and use that to move them around, or even just move the eye layer directly.

If you'll ever want to move the eyes independently, such as in a cross-eyed look, or if your face is drawn in 3/4 view and the eyes move different distances, you will need to use a separate bone or separate layer for each eye.