That's fine..... what Savage is suggesting that say you can combine the three pictures into one big(ger) one, with all of them the right way up, and obne with all bar the middle one right way up, then all you have to do is swap between the two picutes and it will appear as though the middle one is changeing.
Your button has to be able to detect when the mouse is within it's rectangle. I think I remember it being call mouse capture or something like that. It's been more than three years since I did any C++/MFC. Once the button detects that the mouse has entered its rectangle, you can have the button resize the image.
You see, adding a file is two-fold, add it physically and add to the project. (Yes, files a graphic; I recommend PNG.) When a file is in some other project, adding it creates a copy. Do you need a copy? So, copy it manually where they will be in project. Directory structure is all yours, but recommended to be at the ...