What does TfP mean?
TfP = Time for Prints or Time for Pictures
Some projects are to earn money, others are to earn your photos. The basic idea is that a model and a photographer cooperate and both can use the pictures but no money is exchanged. Details see here in English or читать на русском here.
Depending on the project the model can select 10-15 photos she likes most from a preview. The photo-designer works over those photos with Photoshop and she gets the result for her model portfolio on CD or via download. She may use and also publish the photos in online model-portfolios with no cost. But the model is not allowed to sell those pictures.