Artpassing a map as a learning experience

Hey guys
So after testing my last map it seems I still am struggling to get a good handle on map design even after ~300 hours of working in hammer. I'm not trying to get down on myself or trying to find an easy shortcut, (I know there isn't one) I'm just being realistic. I think it may be time for a different approach.
I'm thinking about doing an artpass of a map to help me improve as a mapper. I love working in hammer, but I want to work on something good until I'm competent enough to work on something good and original and working on a decent map in-depth should help me learn good mapping principles in a more immediate way than waiting for test day to be told why all my ideas suck.
So my three questions are: Do you think this is a bad idea? Is there anything I should know before trying this? And is there anything I could do that people are interested in seeing?

EDIT: and as a presumptive reply, I'd be purely doing this for my own learning benefit, not to make my name as a mapper or to create something for release.

I guess my thinking is that if I work with something thats been designed well for gameplay I can learn from it through the careful examination I'd have to do to artpass it, if that makes more sense.

Thanks for the suggestion of using the artpass map yyler, I think that is where I'll start.
I guess my larger point is that while I like using hammer and like the creativity of mapping I feel like I'm just treading water. To make a comparison when I learned drums I could quickly hear what things I was doing wrong, correct those things and thereby progress. When I map I work 20-30 hours to learn so little from feedback it becomes really frustrating. If I don't find a better way for me to improve it'll be hard to fight the temptation to just quit and avoid the hassle.

Sergis said:

watching stvs over and over to understand why players go where they go gives a fuckton more info than feedback ever could give unless you receive fivepage essays regularly

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Thanks so much for saying this. I think half my frustration is coming from what feels like wasted effort, and the other half comes from insubstantial feedback. (Not that I expect anyone to give an essay on why my terrible a1 is so shitty) This'll be really helpful.