18x24 watercolor paper, technical pen and probably pastel pencil or just regular pencil blended with a q-tip. This was done for a friend who owned a wine and spirits shop, so I guess it's a vine. Or a tree. Whichever....
Digital is great -- for composition and color. But for line art? I don't think I can ever give up the fountain pen. This was drawn with a Sailor King of Pen (M) and Sailor 1911L (EF) fountain pens using Pilot Black ink. Yes, sacrilege. Pilot ink in a Sailor. But I have some Kiwa Guro arriving soon!
I drew these guys with a Pilot Custom 823 FA and Platinum Carbon Black ink. The FA nib has a good drawing width on watercolor paper - one of my favorites. It's a soft nib but I don't use the line variation, just some nice shock absorption with each downstroke. The Carbon Black ink is out-of-this-world good, though being pigmented I fear keeping it in too many pens.
I had some leftover watercolor on my palette and added it to some old sketches. This is the Fabriano sketchbook with the red cover. I keep finding it on sale at hobby lobby. It's perfect for using on a plane, or just in general.