Latest questions about "webshots"

I am using some personal pictures for wallpaper. Some of them don't fit on the screen. Is there a way I can ask Webshots to make them fit?

I recently purchased the maximum package on Webshots and used it daily. Due to incompatibility with my email when I installed Yosemite I had to move all my records to a second user (me).

Why does some wallpapers are not set properly to screen even if they have a good resolution?

Is it possible for Webshots wallpaper to fill up my screen without leaving blank, black spaces by the sides. If yes, how?