You can easily convert photo to sketch using InstantPhotoSketch as a professional artist. Lite version of InstantPhotoSketch is free software to use everyone.
Look below examples which made using this method.
Step 1 :- Download InstantPhotoSketch to your computer.
Step 2 :- Lunch the software.
Step 3 :- Click on the “open” Icon and choose the image file that you need to convert to a sketch.
Step 4 :- Then click “create sketch” and after that balance the white and black levels.
Step 5 :- Click on “save” and save it as an image file.