Set the layer of the drawing to multiply blend mode. Lower the transparency and clean up the line drawing.

You should use the undo function frequently to get the very best lines.

Painter IX screenshot

Save the clean drawing as a PSD file and open it in Photoshop. Set the layer's blend mode to multiply.

Photoshop screenshot

Begin by coloring roughly in Photoshop to get an idea of which colors you would like to use.

Photoshop screenshot

Create a layer for each section of the image (in this case the girl's body), and begin painting the foundation color. Paint over the outline in order to be sure that you fill in the whole area.

Photoshop screenshot

When you have finished painting over a section, in order from the top layer, fill in parts that you may have missed and erase whatever color is outside the outline of the body.

Photoshop screenshot

When you have finished filling in all the sections, lock the invisible pixels in each layer. This will allow you to paint freely over the foundation layer without painting over the lines.

Photoshop screenshot

Using the air brush tool, brush in shadows with pressure sensitivity on. This will allow you to easily adjust the darkness of the color.

Photoshop screenshot

Color in the other sections in the same way. Depending on the section, it maybe necessary to use a brighter color than the base color.

Photoshop screenshot

By now you should have about finished with the coloring.

If you have ended up with too many layers, create a layer set and organize them by groups.

Photoshop screenshot

In order to adjust the tone of the line drawing, we want to select and extract the lines into a new layer.

First hide all layers except the line drawing. Open the channel palette and click the RGB channel item while holding down the CTRL key. Everything except the lines will be selected. Invert the selected area in order to select only the lines.

Photoshop screenshot

Now create a new layer and fill in the selected area to create a line outline layer.

Here, a reddish-black color was used.

Photoshop screenshot

This is the background.

Use the air brush tool here as you did with the character.

Photoshop screenshot

Add in some final touch-ups, and use the crop tool to do some final trimming and you're done!