Bought a set of markers and decided to experiment on some of the regular clone troopers and turn them into those that appeared in the series.
Here's Waxer, one of the 212th Attack Battalion under Commander Cody. I like the helmet's kill marks.
Both serves under the command of Obi-wan in the Battle of Ryloth.
Denal, serving under the elite 501st Legion under Captain Rex and fought alongside Anakin Skywalker.
I did not exactly do a fantastic as the strokes were smudgy and I did not managed to draw some of the helmet marking well enough.