Originally Posted by alvin
Personally I have been using prismacolor pens and a mix of prismacolor/copic/blicks markers. Many artists use those markers (which is why I chose to as well) but many artists use whatever medium suits them: pencil, pen, ink, watercolor, acrylic paint, oil paint, gouache, colored pencil, etc.
Yours are coming out GREAT so I can't say you're doing anything wrong!
I'll have to try markers if I get the chance to do sketch cards again. I'm actually mixing watercolors which is time consuming. I think markers would apply much easier. Hey...it's my first time doing sketch cards!