Could you clarify: are you just trying to add the labelled braces to an existing image, or do you want to create that whole picture from scratch?
– John WickersonJul 29 '13 at 06:32
You can put an \includegraphics in a \node, and then draw the braces relative to the nodes.
– Torbjørn T.Jul 29 '13 at 06:33
\includegraphicsin a\node, and then draw the braces relative to the nodes. – Torbjørn T. Jul 29 '13 at 06:33