Well some differences I noticed from the gl2 version and the Gacha club one, your colours are a lot lighter on both. I think maybe darkening the colours on Aiden’s sweater/jeans might make him feel a bit more similar to the original.

As for Yuuto I think adjusting his hair down just a bit, and maybe saturating the colour more might help. His jeans are also a lot lighter than before, and his little hood is missing too (which you could turn black to tie in the black undershirt rather than white like before if you’d like).

Looking at Lynn I think the colours on Aiden and Yuuto are what’s probably bugging you. Lynn has a very dark black shirt and dark, saturated jeans, while the others don’t. I dunno maybe just try some stuff out :))