The Watercolorist - Françoise Hardy in the movie "Grand Prix"

Source photograph: still from the movie "Grand Prix" starring James Garner.

I ran "The Cartoonist" with the default settings to get an abstracted image. That abstracted image is going to be the input to "The Watercolorist".

Abstracted version of the source photograph.

You can play around with parameter "quant_levels" to change the cel shading before watercolorizing it.

Let's run "The Watercolorist" using the default setting. That's our reference.

Input to "The Watercolorist":

image = abstracted_image_after_quantize.png
paper texture = ../texture/free-vector-watercolor-paper-texture.jpg
beta (paper texture) = -2
beta (turbulent flow) = -4
gradient convolution kernel size (edge darkening) = 5
beta (edge_darkening) = -4
output image = watercolor_image.png

Rendered image:

Let's change the paper texture beta from -2.0 to -1.0. This will make the paper texture effect less pronounced.

Input to "The Watercolorist":

image = abstracted_image_after_quantize.png
paper texture = ../texture/free-vector-watercolor-paper-texture.jpg
beta (paper texture) = -1
beta (turbulent flow) = -4
gradient convolution kernel size (edge darkening) = 5
beta (edge_darkening) = -4
output image = watercolor_image.png

Rendered image:

Let's go back to the default settings and change the paper texture from -2.0 to -3.0. This will make the paper texture effect more pronounced.

Input to "The Watercolorist":

image = abstracted_image_after_quantize.png
paper texture = ../texture/free-vector-watercolor-paper-texture.jpg
beta (paper texture) = -3
beta (turbulent flow) = -4
gradient convolution kernel size (edge darkening) = 5
beta (edge_darkening) = -4
output image = watercolor_image.png

Rendered image:

Let's go back to the default settings and change the turbulent flow beta from -4.0 to -2.0. This will make the turbulent flow effect weaker.

Input to "The Watercolorist":

image = abstracted_image_after_quantize.png
paper texture = ../texture/free-vector-watercolor-paper-texture.jpg
beta (paper texture) = -2
beta (turbulent flow) = -2
gradient convolution kernel size (edge darkening) = 5
beta (edge_darkening) = -4
output image = watercolor_image.png

Rendered image:

Let's go back to the default settings and change the turbulent flow beta from -4.0 to -6.0. This will make the turbulent flow effect stronger.

Input to "The Watercolorist":

image = abstracted_image_after_quantize.png
paper texture = ../texture/free-vector-watercolor-paper-texture.jpg
beta (paper texture) = -2
beta (turbulent flow) = -6
gradient convolution kernel size (edge darkening) = 5
beta (edge_darkening) = -4
output image = watercolor_image.png

Rendered image:

Let's go back to the default settings and change the gradient convolution kernel size (edge darkening) from 5 to 21. This will make the edge darkening effect less steep (more smooth).

Input to "The Watercolorist":

image = abstracted_image_after_quantize.png
paper texture = ../texture/free-vector-watercolor-paper-texture.jpg
beta (paper texture) = -2
beta (turbulent flow) = -4
gradient convolution kernel size (edge darkening) = 21
beta (edge_darkening) = -4
output image = watercolor_image.png

Rendered image:

Let's go back to the default settings and change the edge darkening beta from -4.0 to -2.0. This will make the edge darkening effect weaker.

Input to "The Watercolorist":

image = abstracted_image_after_quantize.png
paper texture = ../texture/free-vector-watercolor-paper-texture.jpg
beta (paper texture) = -2
beta (turbulent flow) = -4
gradient convolution kernel size (edge darkening) = 5
beta (edge_darkening) = -2
output image = watercolor_image.png

Rendered image:

Let's go back to the default settings and change the edge darkening beta from -4.0 to -6.0. This will make the edge darkening effect stronger.

Input to "The Watercolorist":

image = abstracted_image_after_quantize.png
paper texture = ../texture/free-vector-watercolor-paper-texture.jpg
beta (paper texture) = -2
beta (turbulent flow) = -4
gradient convolution kernel size (edge darkening) = 5
beta (edge_darkening) = -6
output image = watercolor_image.png

Rendered image:

I think it's probably a good idea to soften the edge darkening effect on Miss Hardy's face.