Hehe)) They only gave the Serpent the stats at level 4, and 18-16 HP is a bit low for level 4)).
But overall, it turned out well! Good job! I would just replace the head with a dragonfly head. I like them more, although I don't really like this unit's appearance. But yours turned out better than in Heroes of Might and Magic III, in my opinion... just the head....)
P.S. I won't talk about the other stats)... although it's possible that the stats are lower due to the large number of abilities).
P.P.S. The drawing is good! Do you have any others?