nitinjain490
Well you will need to load an image into "big_picture" sprite by using 'load' action and insert the url to that image. That's from technical side so for user to be able to change the picture you really need to create and add the UI a.k.a interface (button, file loader/chooser, etc).
Ups you mean just select different image? Sure just add another animation into "big_picture" (for animated one) or just frames (still one). Create variable that will pick an animation or frame for the picture then set an animation or frame from it.