Honestly you seem to be jumping way ahead of your own skills, nor are you following the ref very closely when it comes to the values.
You should be practicing construction, form, values and anatomy and other fundamentals (along with having a solid underdrawing), trying to create jean textures is for much later. I mean props for actually having a ref, it's more than what most people do, but practicing with say, apples and other simpler objects would be better:
http://conceptart.org/forums/showthr...inting-In-PS-2
Though, you get less blurry if you work with 100% opacity and with a sharp brush in large enough size. Also having larger contrasts between your values will create sharper edges.
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