Great work!
As for being tired - there is plenty of time to leave it as it is for awhile, paint something else and come back with fresh eye and strength restored.
By the way - your Concept Sheet looks amazing too - there's a lot going on! But you may have a problem with one of "2D Submission Requirements - "Show the front and back of your final design". Just thought that I'll point it out when there is still time.
Anyway - as I wrote - great work!
Regards
Jonatan