Step 2 Beneath the photo, create a new layer in a mid-tone colour to form the background of the artwork. Create another layer above the photo and trace the model’s outline very roughly with the Pen tool (P), filling it with a colour darker than the background layer. Hide this layer.
Create a third layer at the top of the layer stack and trace the shadows, filling these with an even darker colour. You don’t have to include much detail.
Step 3 Unhide the outline layer and repeat the previous step with multiple colour variations, applied using a variety of blend modes to lighten up the work. Again, there is no need to incorporate much detail. Make sure that you lighten up the areas that are highlights in the original photo and that you darken the shadows.