It's easy to get carried away using filters. I find the greatest challenge, however, is finding a subtle combination of them that actually makes an OK photo even better, pushing it toward the artistic without destroying the original.
Here is a finished portrait of Presley, a Silver Laced Polish rooster, and the changes from the original so you can see the progression. Not only did I use several filters, I used them on multiple copies of the original and gave them different types and percentages of blending modes.
Click to biggify
A little added color for artistic enhancement
Enhanced eye shine through adding a luminosity layer
Here I've accented the edges giving more emphasis to the feathers
The original image--nice enough but not very exciting
For more examples of Photoshop, visit Sunday Stills.