I'm sure this is answered somewhere. I've looked, but still having trouble getting exactly what I'm trying to do. Perhaps I need to use something I'm not familiar with. I'm trying to shift one of two graphics within a figure vertically, without changing the bounds of the entire figure itself.
Here is my default code and close to desired result:
\begin{figure}
\begin{center}
\hspace{-0.25in}\includegraphics[width=0.4\textwidth]{img/a.png}~
\hspace{-0.75in}\frame{\includegraphics[width=0.175\textwidth]{img/b.jpg}}
\end{center}
\caption[stuff]{\label{fig:stuff}Some stuff.}
\end{figure}
I am trying to shift the right graphic up vertically a little bit:

If I adjust with vspace positively/negatively like so, it increases/decreases space between the whole figure and the caption, instead of moving just the right graphic:
\begin{figure}
\begin{center}
\hspace{-0.25in}\includegraphics[width=0.4\textwidth]{img/a.png}~
\hspace{-0.75in}\vspace{0.25in}\frame{\includegraphics[width=0.175\textwidth]{img/b.jpg}}
\end{center}
\caption[stuff]{\label{fig:stuff}Some stuff.}
\end{figure}
How can I shift the right graphics up within the bounds of the figure without changing the space between the entire figure and the caption?


