@bluazurite's post on Artfol

If I put watercolours on a pencil sketch, how much will it smudge?Mar 9, 2023
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I almost always watercolor over pencil these days and it’s fine! Like someone else mentioned though the hardness might make a difference and I typically use hard pencils for sketching
I did pearlescent watercolors on a pencil sketch the other night and had no issues with smudging. I just used a mechanical pencil for the sketch and I think I painted kinda light, though. Maybe do some test sketches before you commit to anything?
it depends on the pencil's hardness, i'd take h or hb and sketch lightly