This would be the easiest tutorial you could ever do with Photoshop CS6 . This will not work on older versions of Photoshop. Just follow my my steps then you’ll be done.
1st step : Open up the image by going File / Open.
2nd step : And then duplicate the layer .
3rd step : Now Go to Filter / Oil paint .
4th step : You will get a box like the above one. Adjust the setting as I did , make everything full Stylization, Cleanliness, Scale, Bristle detail all into 10 and keep the Angular distance to 360 degrees. Keep the Shine to 0 and click Ok.
5th step : Now you’re done save your image.
Heres a final look before and after Oil paint effect.