Images Not Showing Up In Search

My images aren't showing up in a search. I have titles and keywords that should allow them to appear. For example, I have an image called Montana Fencepost. Montana and fencepost are also both key words. When I search Montana Fencepost, only a few images come up, none of them mine. It has been several days since I posted these, so I've passed the 24 hour mark. I even tried typing in my name along with the key words. Still nothing.