my main advice would be to use photo refs as much as u can,,, like you can even try to trace photos or photobash - i see nothing wrong with that but it's a little controversial for some people yeah (ofc don't misuse or anything idk just for a good practice). also a little tip for an accuracy: if a character (or idol or anyone) has some unique features, for example, big round eyes or multiple birthmarks, try to keep it very pointy or resemble ?? i hope it helps