Here I used the technique of blending two versions of an image: one mostly color, and the other mostly lines. Part of the skill is in choosing an image that works really well with this technique. This image works well because it is very simple, no complicated textures, and lots of smooth areas, with contrasting darker features and gestural lines. At least, once I removed the distracting background.
I started with this photo from Pixabay, a source of copyright-free images. I like the dreamy expression in her face, although I can see right away that the background is a potential problem: not only is it too full of distracting details, but it doesn't make a clean separation from her hair and hat.
In iColorama, I applied Adjust/Shadows preset 3 to change the black background to white/gray, using a brush mask to confine the effect to the background.
Here is the brush mask I used. You can see I was not very precise. But you don't have to be, with the watercolor effect I will be using later.
With the brush mask still in place, I used Tone to apply a tint to the background. I exported the brush mask.
Removing the brush mask, I applied Style/Water preset 9. This gives a nice soft wash of her colors.
I enhanced the color in Adjust/Vibrance.
Going back to the pre-Water image, I imported the brush mask and applied Style/Edges. I was able to get nice lines where I wanted them and not too much distracting edges where I didn't want them.
The Edges are rough, so I applied Style/Flow to smooth them.
In Effect/Blend, I blended the Edges image onto the Water image in Darken mode. I resized and re-positioned the top image a bit for a slightly offset look.