Hi! I think mainly you can improve the construction/anatomy, in particular the ball of the hand. Did you make use references?
Most obvious and quickest thing you can do is look at your own hands to make observations. While modeling/sculpting I recommend to have a collection of (anatomical) references on the side, maybe even some models/scans to inspect in 3d. (Btw, the wiki contains some modeled hands, with focus on topology: http://wiki.polycount.com/wiki/Limb_Topology)
What I feel helps when creating a model is to blockout the subject with separated, simple shapes first, put everything in the right place, then merge/remesh and sculpt on top.
Most importantly keep practicing, I think getting better at anatomy is a long-term goal. Might get increased gains doing 2d studies too. As hands are a common subject, there are infinite studies/resources on them (Bammes, Loomis, DaVinci, ...).
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Most obvious and quickest thing you can do is look at your own hands to make observations. While modeling/sculpting I recommend to have a collection of (anatomical) references on the side, maybe even some models/scans to inspect in 3d. (Btw, the wiki contains some modeled hands, with focus on topology: http://wiki.polycount.com/wiki/Limb_Topology)
What I feel helps when creating a model is to blockout the subject with separated, simple shapes first, put everything in the right place, then merge/remesh and sculpt on top.
Most importantly keep practicing, I think getting better at anatomy is a long-term goal. Might get increased gains doing 2d studies too. As hands are a common subject, there are infinite studies/resources on them (Bammes, Loomis, DaVinci, ...).