No, hiding isn't good - having nothing to orientate is really weird while drawing, even if it's only with the pointer down.
I use the tiddlywiki painting for quick sketches only, so this isn't that important, but I'd love to make it mature a bit
The best for sketching is something small and/or pointy
With the various cursor themes and styles that exist out there it's difficult to say what the best cursor might be... My crosshair cursor for example looks like a bullseye
There's no good universal solution I guess
Many words for a small point - maybe at one point the css cursor reliably accepts an svg image?
I was thinking if the drawing app itself can draw a point (small rectangle) at the pointer position <- that's just a thougt
Simon