1. Photoshop Tutorial: New Tricks for Vector Portraits
Artist Daniel Caballero shares the process in making this awesome vector portrait.
He also talks about how to use the Pen tool, and also explains how to add and change details and elements to give the piece a hand drawn look.
2. Illustrator Tutorial: How To Create A Self-Portrait in Geometric Style
Here's a tutorial on making a vector portrait with just geometric shapes in Illustrator.
3. Photoshop: Texture Effects with Vector Graphics
Pure awesomeness. Definitely check this out. An artistic depiction a Twitter user made by Charles Williams. Will learn a lot from this when I try it out.
So...that's it. These are stuff you should definitely try out.
Thanks for reading!