Art A Level: Salt painting and Sewing

I've been having fun recently with salf painting, which is where you apply watercolour paint and then throw a ton of salt on. Here I sewed a portrait (well, half a portrait) and then applied the watercolour paint and the salt after wetting the cardboard I had sewed on. It looks pretty cool but the sewing hurt my hand through the cardboard: I guess I need to learn how to use a thimble.