Mr McThingey

Time for a new doodle-turned-to-fluff. This is what my husband drew up a while ago:

doodle

I got started on it last weekend, and up till now, I have created a body and legs.

amigurumi

Now I am wondering about what technique best to use for Mr McThingey’s face. Should I just embroider it on? Will it look nicer if I get some felt and glue and stick something on? Is it better to use buttons? All ideas to help me out on this one are welcome!