Personal profile gives the details of your personality. Take your time to give all the details possible to attract the most responses. It should be in such a way that you are getting replies from the members best suiting your wishes. But if you include your decent picture along with the profile, that would be awesome.
Photo personals are getting extremely popular these days. In recent research being done, it is proved ads with photos fetch 5-10 times more response than the one without.
Now you will wonder, why and how come a picture is so important when you have an excellent profile? A photo with a profile is important because:

It is human nature that s/he would be curious to see the person whom they are corresponding. Although we would be contended with the communication without a picture but in some corner of the heart and mind, we do want to see that person.

There is an old saying "A picture is worth a thousand words". It is simply impossible for you to describe yourself physically in a way that will accurately reflect how each particular person will perceive you in person. Words are too limiting and every person interprets them differently.

Although words means a lot, but a picture can be real help in accessing a person and his/her character. While communicating with the member, its good to have the image in mind. It makes it easier for you to reply and talk.

Regardless, of what one might say, physical attraction plays a big role in a dating relationships and having a picture speeds up the selection process. You develop a quick connection with a member as opposed to just the name.

While a picture can not guarantee 'chemistry,' but it will definitely help rule out the members that you know you wouldn't be interested in. That is why it is suggested to have a
decent picture so that there is no fear of being rejected.

If you are self conscious about yourself due to one or the other reason, there could possibly be 2 reasons not to feel that way: first, what you feel about yourself other may not feel that way and second, if everything works out, you will be seeing the person one or the other day so it will be better that they should know you from the very beginning.

If somebody is reticent to post a photo it may indicate to others that they have something to hide.

Psychologists have observed that people generally wind up with someone who is about equal to them on a social and appearance level.

Posting more than one photo may also be a good idea. It gives a better idea about you and your personality.