Often, I enjoy to start a sketch with a regular ballpoint pen and follow up in Photoshop. I like how this adds a kind of telephone doodle touch to it.
Paperwalker Journal's Most Favourite Reference/Inspirational Photos, Part 11 - Tourists ride horses past a life-size Apatosaurus statue in Dinosaur Park, near Rapid City, South Dakota, c. 1955. (via)
43 minutes ago