Even if u use an eraser, its noticable, maybe not to regular ppl, but to ppl that actually draw or know art, they would know that u erased
As for me, if I messed up in color or something, id start over, even in linear art there's been times. When I just crumble the paper up n throw it away. Like this linear I recently did, the third hokage, I was already done drawing him, but I threw it away cause the eyes were abit off.
(Btw, when I say linear, I'm not talking about Ps linear)