Type Based Illustration Ideas

Example 1

I really like the style of this portrait it looks both realistic and playful, and the different values are done well. 

Example 2

This example is also very realistic and the face's shape is defined by contrast. 

Example 3

This a different approach to create the features on the face by changing value rather then the shape of the text to show dimension.

Example 4

This one has the same idea as the one above but the high contrast brings the face out and creates a stronger visual. Also the letting is tighter and the base lines run vertical.