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I have joined this hand with the main body with a Boolean Union modifier. However, the union has produced some mesh imperfection along the joined lines as you can see in the second photo.
The joined line in between the mesh seems to be quite fuzzy and the only way I can find to partially correct it is with a creese and smooth brush in sculpting mode. The result is never totally smooth.
Is there a better way to do it?
Here is a pics of the mesh as requested.
Shading artifacts is a common problem using the Boolean workflow. Using the bevel modifier with a very small width can help mitigate the problem. After that, consider marking any edges surrounding flat surfaces as sharp.
Finally, tab into Edit Mode and look for any double vertices or incorrectly shaded n-gons and fix these issues manually. Double vertices can be merged together (try selecting one, then pressing G twice to slide it along the edge into another vertex and Merge by Distance AltM).
Incorrectly shaded n-gons can be broken up, and you can add supporting edges for the merge point in the local geometry.
