This is very beautiful If can say so myself. Though I've seen many, many, MANY pictures of the campers, this one is my favorite so far. The colors are nice and they looks very realistic.
I would also like to add that I'm Puerto Rican as Reyna and she does have many of the physical looks of one. As for the angle on Annabeth's arm, odd but nice nonetheless.
You captured Piper's beauty, something most people don't do because they think she's a Mary Sue. I also love the backgrounds. Very nice, I like them! Nice work! Keep it up!