Gouache on Arches watercolor paper. I have been living overseas for 6 years now with my wife. (Originally from the states) We have lived in Seoul, South Korea, Ho Chi Minh City, Vietnam, Tel Aviv, Israel, and in the Summer we will move once again to Kuala Lumpur, Malaysia. So this is a painting is a sort of self-portrait.
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.
Drawn with a Sailor/Wancher Turquoise 1911L. The M nib on this pen comes to a sharp point which allows for some line variation not from flex but based on how deep the firm nib digs into the watercolor paper. The Noodlers Black ink is a little dry and that contributes to this effect.