Do the anime/cartoon style....
I suggest you get a tablet where you can draw/doodle or do rough sketches. I, myself can say I'm not a pro. So before I did the drawing. I have to go research about making manga styles (doing the head and etc.)
With this part, I chose the YADECH Marie Claire image. Give it a look and know the angles of the head. Then you can start doodling or do rough sketches in Adobe Photoshop (whatever program where you can use your tablet, mine is PS) After rough sketches, I use Adobe Illustrator for cleaning and make lines more clearer. When you're done with your line art, save as PSD in 300dpi.... that's how i save my artworks because it'll have higher resolution and I prefer big DPIs.
Open again your photoshop and open the line art file saved in PSD. There you start coloring. Use the original image as your guide in looking for shadow and light.