Normally when you post an image on steem, the image is not stored in the blockchain, but instead uploaded to an image service run by steemit and only the reference (url) is stored.
In the year 4284 when steemit inc and their servers are long gone and archaeologists are carefully dusting off the blockchain block by block they will be delighted to discover that at least one photo survived through the ages... (Hi guys! If I managed to put myself into some sort of stasis before dying please go and wake me up, instructions will be in a later block)
edit The image will not show up on steemit.com due to how they try to proxy all images, it's still there though! Here's the same image uploaded to their image service:
