what artists do/have done close up art?

im doing an Alevel art project based on the natural patterns within objects/still life which can only be seen in close up. and i need artists!

i have already studied georgia o'keeffe of course, but if you could let me know of any other possible artists that i can look at, that would be great :)

p.s. any media artist is fine, including photography as long as it is not an artist that simply takes photos of things close up. there needs to be something different/interesting about it :D