I’d go with sprite. So just 1. Import png 2. Right click > sprite actions > create sprite 3. place the sprite in the world.
Keep in mind that the engine has some default options to make the scene look good and those can alter your images.
For exposure try setting min and max brightness in postprocessvolume to 1 or 1.5, you can also turn off bloom and anti aliasing in project settings but even without turning those off i get good enough results.
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