How to convert photo to sketch?

I've got a photo or 2 that I'd like to convert to looking like the picture I've attached as an example below.

I'd like to convert a normal picture to one like the one below - what's the best way to do so? is there any free software online? If the only way is photoshop, is there someone that is willing to help me with this (I can pay a small fee for your service). 

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