All three of the latest faces were sketched, initially, and then altered digitally! Being a photographer for almost 30 years, i've embraced the idea of digital manipulation YEARS ago and find it such an exciting way to express myself, artistically. I love taking the initial "vision" and then creating several fresh, new versions!
Trying a "cartoon" effect and playing with color, proved to be the most rewarding tweaks for the latest batch of sketches. It was exciting to see the results of thinking a little bit outside the box. I think you'd be quite pleased with the results using one of your sketches and either photoshop or one of the many free websites available!