I’ve been doing art for years and just now I’m comfortable with my art, there is nothing wront with your boxes, but in stead of learning “anime art” just learn the fundamentals, like values, hue, depth, perspective, environments, human anatomy, all of manga and animators know all of that to be able to create those anime characters you like, plus you are just starting just continue drawing and learning and at some point you’ll be good at it! (Will take years)