I know this has been discussed before but this issue of the photo ladies keeps on popping up; there is a thread response right now from someone thankful they paid a porter so they could skip by them.
In past years, the photo ladies stopped you on arrival, but that no longer happens. Now, they try and stop you on the ramp between the airline counter and customs/security on departure. This is simply a commercial venture run by the airport/outside vendor to take your picture and then sell it to you as you enter the departures lounge. There is no obligation to take part in this. Simply stay to the left as you walk along the ramp and you will easily bypass them. One of the ladies, if they see you, may motion for you to stay to the right. Simply ignore her and keep walking. You certainly do not need a porter, and you should only stay to the right side (in the line up) if you want to spend the money on a picture.