Here're two in-depth, published tutorials I've created on the topic of digital painting techniques. First, a Steampunk-focused pinup tutorial from the pages of ADVANCED PHOTOSHOP MAGAZINE:

Finished art from the tutorial in Advanced Photoshop Magazine #129. Step-by-step instructions and specific Photoshop callouts are detailed in the article.

Thumbnail sketches.
Next, here's a brand-new tutorial from PHOTOSHOP CREATIVE. This time it's Vampires + Steampunk:

Thumbnail sketches.