Art has gone downhill quite a bit with most characters having same face syndrome with different hairstyles or eyebrows. If you compare chapter 1 with recent chapters such as chapter 40 or 48, which both introduced new fights, you can see a vast difference with the first chapter having variation in ‘camera’ angle and height. Also you can see Yuuki in a completely relatable way in the first chapter, whereas recent chapters paint him much more different than he initially seemed.
Last but not least, occasionally the artist doesn’t seem to know how to draw head shapes and it’ll just seem like an oval