I have sculpted a couple of characters with clothing before but I have never sculpted small folds until now. I got a couple of reference images to guide myself but since the folds looked all random in all of them I decided to sculpt them in random places as well.
I am still not done with some areas but I'll be glad to get some feedback before I move on.
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The most obvious problem with your sculpt is that you're being way too timid with your surface strokes.
And please don't post 5.5k pixel images, no one needs a picture that big to evaluate your work especially when the majority of it is empty grey space
Well what I did was to sculpt the folds and reduce the intensity of the layer by 60% and you are right about my images. I'll scale the images down.
Here are a some of the reference I am using.
You might think "a wrinkle is a wrinkle" but that's not really the case, different fabrics fold in different ways with the most important idea being that thinner fabric tends to have more creases and sharp edges and thicker fabric (especially leather) has very large soft folds and billows out in places.
I'd suggest taking two images out of that pile, preferably ones in fairly neutral poses, one for the pants and one for the shirt and just try to duplicate the wrinkles you see in the reference and pay special attention to how the shape of the wrinkle creases and softens and how it indents and protrudes as it starts to get impacted (like near the bottom of the pat leg)
I had to RMA my gpu and I just got it back.
While not wrinkle related, you should also keep in mind that jeans tend to have irregular wear patterns. The fabric over the thighs especially tends to be lighter than the remainder of the jeans. The hems, pockets, and waist also tend to be more worn than the rest.
The jeans also have no fly, which is just odd... some materials stretch enough for that to work (lycra/spandex, for example), but even stretchy jeans don't.