HANDS and Feet
If you ask some scrapbookers and digital hobbyists what keeps them from drawing people, usually it is hands and feet. Some folks adjust by drawing stick figures and others do cartoony feet of oversize feet or bubble type shoes, etc.
Take a look at some of the designs, cartoons, drawings out there and see how simple human figures are drawn.
Since I'm no artist, I look for simple ways and simple shapes to give a hint of what I am designiing. One way to give the suggestion of feet or shoes or sock clad feet is to start with a simple heart shape and use the distort tool, then the dodge and burn. If you are creating bare feet you can add more details using the dodge and burn tool.