I looked through all the galleries going back as far as yesterday and I didn't see your picture. (The cat).
Maybe try again.
First of all, go to the gallery, then click 'edit this gallery' and check that it is set as pad gallery. (At the bottom).
Then re-upload the picture from your computer. It should come up on the 'front page' within ten or fifteen minutes.
If that doesn't work, maybe create a new gallery and try again.
If THAT doesn't work, then something is wrong so you are best to email
slug@pbase.com or
emily@pbase.com.