I use nearlyfreespeech dot net to host my pictures. I was able to set up ftp there so almost anybody should be able to. They have a unique "pay as you go" plan and for me it works out to be the next thing to free. For me anyway I'm probably paying less than $3.00 a year for picture hosting.
I always have at least 300 listings going and my picture hosting has cost me less than 10 dollars total for the last few years. They are a unique host, but they have a lot of loyal users that don't mind the barebones aspect of their business model. You only pay for what you use...It's not a monthly or yearly subscription.