For eyes I use black plastic beads with 4-5mm in diameter.
It is convenient modeling the location of eyes, using pins with ball on the end:
Stitch beads with black threads. Thread the needle alternately into first and the second bead above and below (conditionally, the thread with needle goes along a rectangular contour), then we fix the thread:
Site www.altoysdiy.com is a project of Julia Aleshkina