Man I can go on an entire pages long rant about artists and variety in their works (pinup artists are the absolutely worst in terms of lacking variety and doing the same characters over and over, usually because of a slavish adherence to what commissioners want). I'm kind of with pippipapapopo in that I prefer artists focusing on their OC's since I think it's a bit more fun to establish a universe of characters with their own personalities and stories.
I think Andava has two problems though.
A: he doesn't have enough OC's, or at least not enough variety in appearance. He has one milf in Dylan, one adult in Claudia (two characters he barely draws), and the rest are either teen girls or lolis, and one femboy (who is becoming less and less femboy each month, it took me way to long to recognize Alexis in the August pics) and now one shota. Where are the milfs (Brianna and Lily are complete sluts, I can guarantee they probably have a slutty milf mom)? Where are the thicc chubby girls (again all we have is Eva and he doesn't draw her much)? I guess Emiho is chubby but man is she a rare one. I guess futa's are out because this is a semi-realistic setting (as realistic as Claudia the VAMPIRE can get)? How about another femboy, or a fully decked out goth, or a muscular dommy mommy? He needs more OC's and he needs to get a bit more wild with them. Cassie (absolutely a femcel) was a weird one when he first did her and man did she take off.
B: the complexity of each image itself has gotten a bit lazy. We've all noticed he has a thing for anal, but he used to be a bit more creative with sex positions or camera angles, he had more unique and detailed backgrounds (back when he actually made backgrounds and not just photoshop filtered stock images), more group images instead of just OC+faceless male (this August really was just one of his OC's and a faceless male in a generic background doing anal). And back to the OC point, he would have one or two images that had just a little bit of character or story. He still does these things once in a while but way less often than before. It's all starting to feel formulaic.
I think at this point the Andava name just pays the bills and LilAndy is where he gets a bit more creative and risky. I said I wasn't going to rant and man look at this text wall.
TL;DR: Needs more unique OC's and needs more complex compositions, not just girl+faceless male+anal.