These are the basic steps to make an image look like a drawing in Photoshop. Other adjustments can be made to get it looking right, but these short notes are based on an open image.

1. Duplicate Layer
2. Set Blend Mode (found in layer window) to Color Dodge
3. CMD i – Invert
4. Filter – Blur – Gaussian Blur
5. Adjust radius until it looks good
6. New Adjustment layer – Hue/Saturation to 0
7. Merge Visible
8. Adjust Brightness / Contrast