Your images are not proportional.
For a better visual, these are your image sizes within a 1920x1080 resolution. Along with resolution, there is what is called Aspect Ratio, and all three of your images have different Aspect Ratios.
- 1 - Green
- 2 - Orange
- 5 - Blue
With Gimp and other graphic editors can set a very precise placement of where you want things to be at. You can also scale each graphic layer to what you want.
