>>5765394More often than not the old masters worked by referencing real models rather than from imagination.
Also yes, weird criteria. No employer is going to say you're not allowed to use undo.
But if you work traditionally or otherwise want to avoid ctrl-z for whatever reason, you do that by planning things out and sketching things before working on the final piece, and also using reference.
Go ahead and leave /ic/ now that you've learned a basic thing from 101 art class.