The only way I know how to do that is inside a graphic program. I use Paint Shop Pro. 

You can look for plugins that will give the painted look.  Virtual Painter is one such plugin.

I don't know Photoshop, but in Paint Shop Pro there is an area called "Artist Effects",. The image shows what effects I can apply. The sample inside is done with "Brush Strokes".

Also, you should have a plugin called "Texturizer", you can apply a texture like canvas or stucco or something to the image to give it a different look.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi