Mm. I try to leave my descriptions just vague enough to leave me able to get creative, but strict enough to let me in and not leave everyone in the dark. 

I can't speak for the GM, but if you're drawing your guy/gal/whatever, I think it'd be ok to write it as best you can, even if your best isnt up to par. I mean, a picture's worth a thousand words, yea?

EDIT: hey [@Bad Weather]
[url=http://beanie-beanie.deviantart.com/art/freya-holton-full-page-566456376?ga_submit_new=10%253A1444971611]HEEEEEEEEERE SHE IS[/url]

and here's [url=http://beanie-beanie.deviantart.com/art/freya-Holton-body-566456356]a closer shot of her body[/url]