Image imported from derpibooru 
Original Description:
 
And here it was…the finale of the transformation! The head! His black armored chitin was beginning to be rearranged and pushed back to become a helmet-like armor section while a brown chitined muzzle began to push out to the front, replacing the entire lower portion which used to be just tiny mandibles and a black horn…now it was looking like a cross between a horses muzzle and the nose-horn being incorporated into it…still giving it the hybrid look! And with that…his upper horn was growing over and arching to keep the Hercules beetle feel too! Still usable but now stronger than ever to ram foes and kept reminiscent of his old form.
 
Another body part that would be granted to him would be the protrusions sprouting like shrubs from the sides of his developing head, coming out from just under his helmet-like head-armor were elvish-like ears that pointed to the side with equally brown earholes to boot…his hearing was now much clearer and stronger now…and to boot he had no nostrils to boot either on his now equine-buggish muzzle…like he ever needs it anyway with these new senses of love and emotion flooding into his now more opened mind.
 
His once beady black compound eyes which once showed no sign of intelligence or sapience, only animalistic instinct and blank insect-ness were now expanding astronomically to fit along this new, larger horse-ian head, becoming more ovular in shape and being slightly moved to the front, giving a diagonal view of peripheral vision. His vision of course became much wider and colorful, much like a humans with the more peripheral sides of it being weirdly black and white more better awareness, due to the compound structure of the eyes…which were now an emerald green like the gem that changed him.
 
They were filled with intelligence…sapience…thought…desires, ambitions, wit. Now filled with the knowledge on how to magically morph on a wim into anything. Animals, objects…vehicles…anything he can focus on and remember with the power of this new magic flowing through him and around…his new tongue letting him taste the atmospheric love which tasted like the lovely scent of nectar and honey. The catchlights that now shone on his intelligent eyes backed up the evidence of this…and as his neck had fully been metamorphized, new vocal cords and a voice box had been formed which he never had as a normal Hercules beetle…with the newfound ability of also mimicking any sort of animal noise or voice of anyone he knew…any gender and such! And with that…he spelt out his first words in a quite a handsome but quirky young tonne.
 
Peter could realize this now…he was a fan of the said show…and he knew the creature that Herc was being changed into.