What sort of photos are you wanting to post?
Photos of YOUR art?
Photos you find in other places on the internet?
If it is YOUR art, then this is pretty simple. If other places on the internet, then not always so simple, BUT possible.
When you just write the code that links to an image on the internet in such a way that it shows the picture here, then this is hot linking, and websites (I think) usually prefer that you not do it this way, because if too many people do it this way, then it might exhaust the website's allowances for transferring data, causing problems for them.