That's certainly a neat effect and works well on portraits as I found when I tried it on some recent ones I shot for the local theatre group.
Here's one of them - I did cut back the opacity of the luminosity layer to 60% otherwise it followed the tutorial with a 600x900 pixel image
Just for fun I took the same portrait and ran it through Topaz Impression with a Van Gogh preset.
Not being an art expert I'm not sure which one looks the most like one that Van Gogh would have painted but my preference is for #1 although I might just have to try a combination of the two for the owner of the face
There is one caveat not mentioned in the tutorial, which is that the strength of the effect depends on the resolution of your image; the lower the resolution the stronger the effect. In my example below I used a resolution of 180 pixels/inch (to change resolution, click Image > Resize > Resize Image..., make sure Resample Image is checked, then modify the Resolution before you begin).
Whippet, "Wrong subject I think."
I think your image is a good one for this effect.
If you want to make the effect stronger on a large image use tpgettys suggestion - lower the resolution of a big image before using the Graphic Novel effect.