It is insane what he does but yes, we should point people who fall back to powerpoint at actial decent image progams such as paint.net or GIMP. Generally the first if they are used to windows programs.
Ive made a few nuce watch hand sets, modified a vould of dials and a few other things in paint.net.
It supports layers too which id great forskeching over other eork or lining up numbers with tickmatrks.