Similar to Webflow — which is an excellent intro to styling websites for non-technical folks — there's a WordPress plugin called Oxygen[1] which I really recommend checking out as it is more-less the same as Webflow, just built on top of WordPress which you can use locally, or whatever.
We are a design studio called Superawesome, and we just launched Microawesome https://microaweso.me/ a few months ago, which is a productized service kind of deal. We do tiny, fixed-price projects with quick turnaround. The kicker is we don't do revisions — we call it "what you get is what you get" — and this is where we're making savings for our clients.
We've learned over the years that we spend most of our time convincing clients to trust us and sign off on work we already know is good. Through Microawesome we're asking them to trust us, and in return they will get a good result fast.
It is definitely not for everyone, but that's why we're doing it "on the side", we still have our studio which offers a standard agency-type design service.
As a designer, sometimes all I work with sometimes are images (e.g. when working on a moodboard), and this would enable me to work much more efficiently.
There are no separate boxes for images as of now. I'll definitely think about adding it soon! But for now, you can resize images inside the rich text box to the same size as the box and it'll replicate what you are asking for. Also, you can directly copy paste imgur links in (like for videos) text box and it will fetch the images automatically in a separate box like this: https://imgur.com/a/LcUpk
(imgur image box on the right)