When images are uploaded to Picfair, they can be purchased as prints or digital downloads an unlimited amount of times, and it isn't currently possible to sell your images as limited editions.
Is there any other way I can limit how many times an image can be licensed?
You can remove your images from your store at any time, therefore if you only wanted to sell your images a number of times, you can delete them from your store and profile once they have reached a number of sales, therefore limiting the number of times the image is licensed on Picfair.
How can I see how many times an image has been licensed?
You can see how many times an image has been licensed from your dashboard, here.