I have had the app for about a year through myspace. I use it infrequently and prefer to make contact on my own rather than having a picture up. I've looked at my own profile through the 'my profile' link to check spelling etc and the picture there was the generic 'no picture'.
What they DON'T tell you when you sign up through either myspace or facebook is that they USE your picture from that site as a default picture. Your profile will look to you as not having a picture but to everyone else it's your other site picture. I only found out about this when someone teased me about being on the site as they saw my picture there and when I went to the 'help' section they tell you there.