https://www.deviantart.com/rednblacksalamander/art/Growing-up-is-hard-601454857
https://www.deviantart.com/rednblacksalamander/art/Dogs-of-War-795135644
https://www.deviantart.com/rednblacksalamander/art/Normal-Day-801504776
https://www.deviantart.com/rednblacksalamander/art/Campism-914072060
It's because he adds too many ruffles, creases, crevices, etc. to a fairly plain art style and colour palette. It ends up clashing as well as making everything look kinda' dirty.
Look at the DPRK dog vs. the fairly OK-looking PRC Panda.