There are so many effects applied on this pic, I applied some of photoshop filters just to match this style, I dont know whether they are useful or not for you but they can make similar output which you can use....
You can apply halftone filter also,in the last i have mentioned some tutorials please see them..
In First image example I applied patchwork this goes bit similar to your image.( Open image in new window for clarity )
In second image example I used Texturizer it also goes similar with your image in this you can change appearance setting from drop down, They all give different output..you can try and match if you need something from there....( Open image in new window for clarity )
In this image example I first applied grain than i reduced this layer opacity, this also goes with your image, you can try hue and saturation and many more effects on this layer to pop out the background though i just tried a bit to show you...( Open image in new window for clarity )
This effect can also achieved with the help of halftone effects :
- Halftone effect
- Halftone and bitmap effects
Hope this will help a bit...