Drawing on an image

To make it easier to find the desired points in the new coordinate system, you can draw a labeled grid on top of the image while you’re working on it:

    \node[anchor=south west,inner sep=0] (image) at (0,0) {\includegraphics[width=0.9\textwidth]{some_image.jpg}};
    \begin{scope}[x={(image.south east)},y={(image.north west)}]
        \draw[red,ultra thick,rounded corners] (0.62,0.65) rectangle (0.78,0.75);

Image source: Wikipedia

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