Sergals are a fun species, but a lot of people have a bit of trouble getting the shape of their head correct.

This tutorial has a step-by step procedure for drawing them inside:

1: Draw a wedge of cheese.

2: Draw the mouth near the front of the wedge.

3: Add eyes somewhere near the back.

After that, you should have a fully developed sergal head, and you'll just need to colour it in and shade it like normal. Have fun!

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Secret for drawing the head of a sergal stolen from the encrypted memories of  sealer4258.