There is nothing better at Halloween time than updating your profile pic with a Halloween selfie. In this photo above I am peeking around the corner of a curtain with an element of terror. If you want to amplify the look, consider using a filter on Photoshop like "poster edge" or just up the contrast. I also took a pic of a Halloween mask on a piece of black fabric and cut and pasted it to my eye's iris so you could see what I am screaming at.
A gothic mood involves a black background, some candelight, gauzy ghost, slightly lit figure behind you....
Consider making everything black so that your flesh is the only thing that pops out in the photo -
Try moving the camera back and forth fast as you take the pic so you blur out -
Take on the look and attitude of your subject -