Thanks Beans. I think I see what you are saying there, the white from the shirt kind of runs onto the pants... is that what you are getting at?
Anyway, the Denim effect well, I used a couple of Rackham blue paints one for base and then a darker one for a wash, then I used some white and tried to do some crosshatching, then I washed again with GW Foundation Charadon Granite and well, this was the result.
Hope that helps.