What about that round one? [Ain is Helping with rocks. Vash has a rather nice, tumbled stone in his hand — though it's not polished in a way that rock shops usually do, it's been weathered to a nice pebble shape.] Oh! We can give it heterochromia if we use that black rock. See?

[Ah yes, snowman heterochromia, a very important design choice.]

Do we want to build the smile out of little twigs, or rocks?