In general, use primary sources whenever you run into problems.
I.E. don\'t rely on someone elses rendition, go find a real life example.
First, get on a pair of jeans, and go and stand in front of a full length mirror, look long and hard at where the creases actually form.
Second, again, get in frony of a full length mirror, adopt that same pose with yoiur hands on your his, and look long and hard at your wrists, where your arm meets your hands, look at how your fingers curve around your hips, (billy, lizcam, don\'t even go there...)
When I studied lifedrawing, the most important thing I learned was that before you can learn to draw or sculpt, you\'ve gotta learn how to look.
That ¡s the best piece of advice I can give you, as technically, I think you sculpt a shit load better than I dolol