Using Picnik you can, and the best thing is you don't need to upgrade to the premium account to get this look! =]
(The photos of the rabbit and dog I just downloaded from Google Images then edited.)
Step 1: Upload
Click "Get Started Now"
Then "Upload A Photo" and choose a picture from your hardrive.
Then you can Auto Fix it, or play about with exposure using "Basic Edits" I just Auto Fixed it and went straight to "Feautured"!
Step 2: Eyes
During Halloween it's under "Featured" or any other time of year it's under "Seasonal".
Alter the size of the brush and swoosh over the eyes, you can also fade the colour if you like.
There is also "Ghoul Eyes" a little further down the page is you are going for a more zombie-ish look.
I then used Face Paint, In red with a tiny brush to redden the eyes bit more.
Step 3: Fur
I applied a very faded layer of "Dracular Dermis" in "Fed" to give it a more Gold look to it.
I also darkend the fur using "Face Paint" in Black with a large brush.
Drag it over the ears, forehead and back then faded it slightly.
I also used the same technique to highlight the fur using White, between the eyes and tip of the nose.
Step 4: Background
I used the face paint again in black.
It comes out quite pale so I re-applied it twice and added the effect "Vignette" to also darken the corners a bit more!
Step 5: Coat
Step 6: Finishing Touches!
Step 7: Save- and Your Done!
You can do a more zombie-esk look with Ghool Eyes, and yellow and green face paint.
...or a vampire with fangs and bright red eyes!
I went for a Demon look.
It's totally up to you, play about with it! This is just my interpretation of it.
Please remember to Vote for me in the Halloween Photo editing contest and If you do make this, please post the picture! Any questions let me know in the comment section
I hope this instructable has been helpful to you-