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I hate that I can't use other artists work as reference because I won't actually be learning anything from that, but finding good reference pics for free online is unusually hard. Head to toe body shots with good lighting are hard to find, so much cropped shit out there.
Sometimes you can learn from looking at other artists' work. I try to take a look at where and how they curve a line/the varying thickness of lines and how that makes a difference in their art
I just compare and see what they're doing different.
There are sites for nude/clothed models in various poses for reference too