Today we are going to see how to convert your picture to a sketch.
1. Open any image of your choice. Duplicate the image by selecting Layer -> Duplicate layer.
2. With the duplicate layer selected go to Image -> Adjustments -> Desaturate.
Again duplicate this desaturated layer. Now go to Image -> Adjustments -> Invert.
Change the blend mode to color dodge. This will make the image white.
3. Now go to Filter -> Blur -> Gaussian blur. Change the radius to achieve the sketch effect. I used 4.9pixels. But it will vary on the image you selected. So try which radius range suits your image.
Heres the final result: