Quite by accident, I discovered a way to turn a picture or a tube into a "painting" or "drawing" or maybe you think it's more like a pencil sketch? Anyhow, the effect is SO good, and SO easy, I can't believe I haven't tried it before! It's actually over-sharpening images! That's it!
Open any picture, or place a tube in a new image - filled for not filled, your choice. For the sample here I filled with the background used on this site, then added a layer, then added the tube. Then from the Effects menu, select Sharpen, Sharpen. Repeat until you get the effect desired.