Without a decent profile photo you are not going to be successful with your online dating.The single most important aspect of the photos is eye contact. Natural looking eye contact will result in many more replies to your online profile. Don't try to be arty and look away from the camera and don't post photos of yourself wearing sunglasses - it doesn't work.
A tried and trusted technique is to look slightly above the camera lens - focus on the logo on top of the camera. We suggest you try and laugh with your eyes. A good way to achieve this effect is to squint ever so slightly with your lower eye lids only. Don't over do the squinting unless you want to look like Clint Eastwood ready for a shoot out.
It can also help to think of something hilarious in your life or imagine a funny situation, such as everybody turning up for work completely naked - did you just smile them?