Not sure how this can be achieved in Webflow, but I can point you in the right direction. Usually, what you want done is achieved this way:
SVG curves (no need for your HUGE images now, and responsive to your various breakpoints) as dividers.
Did some Googling for you, these might help.
Spent 5 seconds searching for these links, so if you search a bit more, you can probably find a concrete solution. Considering that this is a common thing that people want to achieve.