Great examples of beautiful camera bags!I really like the shape of the camera bag as a cross body, especially for travel. I think that you can avoid the box-like look by looking for the size that isn't too small or big. If the straps are removable, then you can use it as a clutch. With some details, it can be more feminine. Here are some examples of what I mean. I'll pick on Chanel since they seems to be one of the few to offer the style in different variations over the decades.
I love the outside full pocket (not a little patch that you can't fit a smart phone in), I wish more designers would include larger outside pockets into their designs instead of just adding a small rectangular piece of leather patch like an after thought.
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I agree that if the size is too big for your frame then it doesn't look good. The bag below illustrates this. How the bag sits from the front, doesn't look nice. If the strap was shorter maybe it wouldn't look too bad.
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But...I have to say the photos of the actress wearing the bags don’t look bad to me at all. I’m slim and a small or smallish medium bag looks best in my frame. But, sometimes I actually have to carry things. LOL! So, I can’t just think about scale. These look just fine to me.