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I have been asked a few times!

The simple answer is that it's more complicated than it seems!

I use a variety of apps for the cartoon bit but I also remove the background of the initial photo and then use a filter to reduce everything to outlines and then combine various different effects on layers with different layer effects such as multiply and hard light until I get the image just right :0)

Sounds technical, but worth it I think as your post image always stands out with originality, nice!

Lol, cheers man!