One approach I teach is to start with a monochromatic underpainting. This lets you get create a solid representation of your subject before getting into trouble with color. Here's a video that shows you how:
(If you're getting this via email, you won't see the video. Go here instead: https://www.youtube.com/embed/Pn0PIH2M0uI)
Here's on more that shows a sequence without sound:
(Again, for email receipients: https://www.youtube.com/embed/d_uqo2Qr1lA)
More videos are available at my online workshop! https://www.udemy.com/user/michaelchesleyjohnson/