Quite dark here, and perhaps these hands could use a few other symbols to help us out: tools, workbench, etc. Isolating them, we rely on your title to tell us they are carpenter's hands. I like the framing and cropping here, and the pose of the hands is also effective.
Although a good idea, this interpretation isn't very compelling. It's too dark, so the interesting details of the hands' surfaces are obscured. Including some context in the background would have also added interest (for example, his woodshop with tools or works in progress showing, or a newly framed house).
Carpenter needs to get more lights if he doesn't want to smash his thumbs. This image is quite dark and thus has low contrast. Can't tell if we're looking down at water or up at some tree branches and sky.