Photohostess.com is a free image host intended for use with Niteflirt. One of their requirements is that all the photos be Niteflirt-compliant, so when you use them, keep that in mind. It is a free service. If it doesn't fit your needs, you might be better off getting your own domain or other paid hosting.
Photohostess provides you with a great many links. Unfortunately, they don't provide you with exactly the one you need. But using this generator you can turn photohostess.com or any other image links into code you can use on Niteflirt or wherever you need HTML code for your image.
Use the naked photohostess.com link on the bottom of the list of links they provide you with, the one that has a "Direct" label to the right of it. It must start with "http://" or it won't work.
Want it to link to a ptv or your blog? Use this one. If you are trying to link to a payment mail or a website, the link you copy in must begin with "http://" or the code won't work for you.
Want to create a text link? Type the text in the text box and the link text in the link box.