What you need to do is find the Sim that you need to take the picture of, introduce yourself and then take their picture using the cell phone or an actual camera; you can ask them to pose if you want to. I haven't had the 'online dating photo' opportunity but I have done a 'passport photo' opp and I'm assuming it works the same way.
From the title of your thread it sounds like you need to take a picture of Layla Lufti, is that correct? She lives in Egypt and so to take her picture your Sim would have to travel to Egypt and find her there. You need the World Adventures expansion to complete this. When you've taken her picture the opp should tell you who to bring it to but my guess is it would be her, so click on Layla again and hit the 'deliver picture' option (it should be yellow).
If you click on your Sim's 'Opportunities' tab (the star), and hover your mouse over the icon on the left for that opp it will give you additional information to the short write-up on the right. I've found that this is usually more specific in terms of directing the player towards the Sim your Sim needs to talk to. I'm assuming it's a 'home opp' but it might be under 'adventures.'
Hope this helps. If not, give a shout back.
