@PANDAKIDIOSHI6 omgg HIII <3 no you're not bothering me at all!!!!! reading this made my day so much better omg. I'm so honored you want to draw them!! True, I kind of sprinkle the descriptions of each character throughout the book rather than describe all at once. I'm happy to help! I'll write a quick summary of the complete description for the main ones (and if you need for another character let me know!).
Atlas: dark brown hair, green eyes, dimples (ofc lol), fair skin.
Nyxir: long black hair (reaches his lower back). sharp, siren, golden eyes. has a fit physique and abs. He also small patches of scales across his body (not excessive!). He also has light brown skin! [You can also see my own drawing of Nyxir in ch.34 for a clearer idea of what he looks like in general!]
Veylith: light brown hair, lavender eyes, has a patch of sage scales on his neck and one that stretches from near his belly button towards his waist. Also has a fit physique and abs. Technically he has brown skin too, but his skin color is a very very very light brown, that it almost appears fair. [You can see my own drawing of Veylith in ch.44! I posted it there]
Oren: dark brown hair, dark brown eyes, scar across his cheek, has a patch of scales on the back of his arm and back of his shoulder. He also has abs and a fit physique, but I imagine him to be more buff than the rest. He also has light brown skin like Nyxir.
(Note that Nyxir, Veylith, Oren all have fangs and their pupils are slits like the pupils of a snake)
I hope this helped, and if you need more details let me know! I'll try my best <3 again I'm just so so so honored that you want to draw them!! THANK YOU SO MUCH <3333 I'd love to see whenever you're done (but take your time ofc). And again if you need more help let me know at any time!