Responses
Either the artist changed or its the same artist that decided to try developing/adjusting their style. Honestly I wouldnt worry too badly about it, every single time I try reading a dungeon type action story, at some point after ch.40 everyone starts commenting the same thing about the art being different. At this point I'm treating it as a canon event/evolution of action stories (or any long running series in general)
Did the artist change? the characters look more skinny and nothing with that slutty waists