/ic/ - Artwork/Critique

I still don't really understand how to do construction or make use of it. I know this has mistakes and some of the placement is wrong; am I supposed to iron out every issue in this phase and make sure everything is perfect before moving on to the sketch? How do you guys actually use construction?

I also feel like a cheater because when I use a photo reference, I like to move my lines on top of the reference image occasionally just to make sure things are right instead of measuring by eye. I know that's basically equivalent to tracing and I should stop, but shit everything I'd draw would take 5x more time if I did