I like my first idea best as far as use of space. I know people say not to put toilets on an outside wall. We had one in our last house in Iowa, but we had 2X6 construction. I don't know how high your window is, but I'm guessing the toilet would fit under there. The shower would be 5 feet long or shorter if you want a wider space to get to the toilet. (kind of tight the way I have drawn). You could do a 5 and half foot long shower and do an angled door at the left end to allow room between the shower and toilet. The vanity would be about 7 feet long, unless you do a 60 inch vanity with a linen cabinet at the door. I would reverse entry door swing if you do that.. The second top right could work and you would still have a small closet. The bottom left plan would require waterproofing your front window. Hopefully someone will give you other ideas. The bottom right plan is bigger, but no closet. Each square equals 1 foot.

R.O. you could do some painting of the walls to mimic that first photo. Or hire someone do to that framed trim. It would really add some drama to the room. You said warm colors but what about a neutral cool? I am not sure your budget but if you check out places like Homegoods you might find some really gorgeous drapes and hardware. Hang them as high as you can. After you find drapes you like, find a matching color or similar color for your walls. I saw those side table lamps and the exact bench in Homegoods yesterday. ANd of course Wayfair tufted bench round chandelier

The exterior is a hodgepodge victorian/gothic farmhouse. The interior has been modified several times (and not well) My kitchen is being reno'd too will have shaker cabinets. All hardwoods everywhere. Here is a photo of exterior and before pics of bedroom & bathroom

We're adding a slightly larger master suite (20x26) that also includes reconfiguring the original space to create a hallway entrance next to an existing hall bath. Our architect configured the space so that the new master bath abuts the existing hall bath, presumably to minimize the plumbing work etc, as in the 2nd sketch by @er612. She also aligned the new master closet with the existing space which just helps as a sound buffer. The rest of the layout was decided based on views - optimal placement of windows, strategic placement of the bathroom door, having wall space for a TV if you want that.