My best brush used for my daughter's portrait, mechanical pencil added for size comparison. Paper 30cmx42 (12"x16).
(CLICK IMAGES FOR LARGER VIEW) The brand name has worn off the brush I've had it so long, and I have many brushes and don't use it all the time, but it is the best brush for both washes and detail. It's very possibly a Kolinsky Sable Mop:
Do yourself a favour and enjoy your watercolouring with great tools. It will make such a difference plus take the stress out of wondering whether something will turn out good or not!
Drawings in pencil on black paper:
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