I been following since Mature Quest was in development on FC2, and when Mature Quest dropped I made sure to follow the artist and the artist goes by Kuzumi, the mainly publish under the Studio Pork banner, and were also made a few VN's/Artist CG's prior to mature quest under the Studio Pork name a few of these being dragon quest flavored. If you even compare the prior VN titles that released before mature quest and even most of the titles after, he draws the same eyes, same nipples same everything. The guys an expert on anime milfs at this point and one of my all time favorite.
The biggest difference between mature quest and his VN's are mature quest CG's are heavily downscaled for old rpgmaker and overlayed on top of the games background in most cases besides a few scenes, while his VN's are typically fuller scale resolution with full backgrounds he made.
Also I believe in reference to the above post the artist that dropped the brush is the artist who did all the pixel sprites and game sprites, not the character/h-cg.