Can a picture be used more than once in the same tabblo?

The caption beside the bottom picture was typed beside one of the ones above this.  What made it jump to a different photo?  I'm guessing that since this is new, someone is probably checking out new registrations, so I hope someone will answer my questions.

What is the maximum # of pictures I can use in one tabblo?

Ok, now my pictures went away and the layout changed.  Nothing is written where it was and I can't drag the pictures back on the canvas.  The non-existent tutorials are not helping.  I guess I'll check back after a few days when I have more time to play.

I'd like to be able to make a collage of overlapping pictures.  Can I do this?   Can the text be in other colors?  Are there any user configured layouts or am I limited only to the layouts shown?

How do I move the pictures where I want them?