I would make two <div>'s and display them inline, for the two columns. So the second div would have the picture, and the first one would have the form stuff.
You could do that very easily with bootstrap, as it has the prebuilt classes for rows/columns, inputs, and alert boxes. I would recommend against using inline divs and floating, as that can be a huge pain. If you don’t want to use Bootstrap, instead of inlining or floating, the best way would probably be to use flexbox.