Before you can begin tweaking your photo to look like spray paint art, you'll need to do a few adjustments. Spray paint art is known for its high contrast and saturated colors, so you will want to incorporate this into your finished product. To do this, go to Image>>Adjustments. Raise the contrast of your image and then raise the saturation. There are even times when you may want to play with the hue of your photo for a more artistic look.
For example, I am using this picture
for this tutorial. I adjust the contrast by +60, and then adjust the saturation by +30 and end up with this image
. Just these two adjustments create a striking look, and if I play with the hue, I can get many other versions of this photo. The photos below are a few of my options.
Alternatively, if you only want certain parts of the image to stand out, you can use the sponge tool, set the mode to 'Saturate", the opacity to 20 and then brush over the area you want to 'pop'. Even using these techniques together can produce amazing effects in your "spray painted" image.