Hi ZachSaucier,
Thanks a lot for all the help. Before I changed the images' width property, I tried doing it with scale. Problem is, it looks like the orientation gets all messed up, don't know why.
Following your advice, I did a codepen copy of the website (minus the images) for you to see. Notice the (horribly) colored images on the right of the screen when you scroll.
https://codepen.io/leleoalmeida/pen/poJaZrZ
Regarding ScrollMagic, thanks for showing me that it is possible to do it with GSAP natively! I'll definitely take a look into it.
Thanks once again for the help.