Hands are the most complicated part of human body, so you really need to sculpt a lot of hands in order to make realistic looking hands. Here's the full process video of sculpting a hand. started from a simple base mesh in zbrush and slowly refine it to make it looks like a hand. It is not a tutorial but I hope you find it useful. Also make sure to subscribe to this channel so you don't miss my future videos. Artstation: Instagram:
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