I was posting progress in the what you working on thread but decided to start a new one to get more feedback. I started this project as a way to get back into Zbrush and learn new things about high poly sculpting here is my progress so far, I haven't started on the lower half and he still needs to have a jacket added to him
Here is a quick ref pic of the character for people unfamiliar with him
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On the left is your muscle flow, which is wrong and going down (to the abs and external oblique), on the right a more correct one, going all the way under the deltoids. (sorry for the bad drawing, don't have my tablet atm)
Good ref for your purposes :