The front view of a walk cycle has the same principles as the side view -
See this page for a detailed explanation on how to animate a walk from the side.
Most walking cycles work best at 9 frames per step = 18 frame cycle for both feet.
The animation presented below is slower - this is a 24 frame walkcycle (for a double step, both legs) at 24 fps, without any inbetweens:
Moves up and down as it does in the side view.
If you wish to elaborate - show the hips swinging - the foot that's forward brings its side of the pelvis down.
Most of the foreshortening happens to calf.
The thigh gets fore-shortened as well but unless your character brings its knees up very high - don't shorten the thighs too much.
If you are animating Flash or After Effects Cut Outs, you have no choice - You need to draw the foot from three angles and switch between them as you animate:
It's not very convincing otherwise.
For different kinds of characters, play with
Modify these simple key frames to fit your character.
Gotta' run :-)
Click here for the Running Cycle Tutorial
To get a deeper understanding of the principles of walking see Animate a walking cycle from the side-view