we got GENIUSES in the comments like "well what if I prefer the shoe on the left? I don't like tennis shoes" then look up a reference for a different type of shoe if you wanna draw a different type of shoe??? hello??l
biggest art advice i can give is look up a reference for everything, even if you're sure you already know how it looks. as an experiment i quickly drew a sneaker by memory, and then by looking up a reference for the type of shoe i really had in mind