We will adapt our mascot for this exercise, but you can start from scratch if you'd like. Depending on your work, it may be easier to have a blank canvas. Regardless, these steps will apply.
Rough Sketch
This is going to build the foundation of your final artwork. Strong character design was so important when they move so little that you'll want to ensure you're solid here. Keep your forms geometric, paying attention to silhouette. Can you tell who you look at when your character is filled with solid black? If not, readjust by exaggerating your shapes.
Facial features should be minimal but expressive. We went with classic oval eyes and a big goofy grin. Look at multiple examples to notice similarities and differences.
Refined Sketch
Once you have your pose and rough shape blocked out, refine your sketch with more details and those elements to enhance the design. These clothes, accessories, and other components will make it into the final illustration.
Inking
Hanna-Barbera utilized clean, consistent inking with a bit of variation to emphasize forms. We used the Ramen Brush available in the Standard Pen pack and our Steal This Brush Pack, which is free (for personal use). Start your lines with a light hand, applying a bit of pressure as you move toward the center of the stroke and rereleasing pressure. This will create an attractive tapered ink line.
Remember to keep your outer lines thicker than your inner lines. This solidifies your form and also creates variation, which makes the character more interesting to look at. That's what you want when your animation is pretty static!
Color and Detail
Early animation used flat blocks of color painted on cellophane or plastic "cells" with shading and detail reserved for the static backgrounds. Color your character in flat, limited palettes.
You could include a background as well. Pick a painterly brush, such as a gouache brush from our Woodland Wonderland pack. Apply as much detail and texture as you'd like, but make sure your background doesn't distract from the characters.