Banjo rejects Scrimblo Bimblo, embraces Anime.
About the drawing, have you ever used curve, circle, & line tools? Try using those said tools if you're struggling to make perfect straight lines, perfect round corners, & perfect circles freehanded.
Also, you forgot to add some vintage TV related filters (I.E. scanlines, video degrading, etc.) to give it a true authentic 80s Anime experience. (I recommend using Gimp cause it has a lot of filters & it's arguably easier to use, once you understand how to use them.)