omg hehe it's actually really simple i just made it a singular image that fits a 14:8 ratio, and then cut the image in half&posted both halves as two separate images. for a twt with two images the aspect ratio should be 7:8 so that's why i used the 14:8 aspect ratio for the entire image. also another tip/note: i chose to cut the image at a point where it doesn't really warp the image (i.e. not in the middle of someone's face or in the middle of a word) so i think that makes it look smoother as well!
i hope this made sense! feel free to dm me if it didn't • ᴗ •̥ ˳ ˳