Eye - DO NOT try anime or cartoon before you can do realistic. Also shorter distance from eye to muzzle end
Forhead and muzzle - They had a more straight head, with a rectangular shape, the nose comes off the muzzle a bit.
Main - Hyena do not have forehead scruff, it starts between the ears it is also messy and a bit curly depending on the specific hyena
Ear - they have very round ears from a front angle and conish shape from side
Neck - neck curves in or is straight it does not puff out that far
I hope this helps