I would be tempted to paint the closet doors and built-ins the same color as the wall so that they blend in and provide less contrast in your small room. If you did that, it wouldn't be necessary to change the casings. Let the bed be the star. You can add pillows and throws with color and texture to add interest and draw your eye to the bed and away from the size of the room. Don't forget to paint the inside edge of the door to your bathroom to finish off that entrance.

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.

Ok more info. Go to your ideabooks. Click on one. In upper right corner it says “select” and there are 3 dots ... Click on those dots. A menu will display. Click on “Ideabook settings”. That should bring up screen where you can slide button over to make that ideabook “private”. Then click “done” in upper right corner and you should see lock on ideabook when next displayed. Try it. Let me know if it works for you. There might be other ways but this seemed to work.

Start with the hardwood floors so you know what color you're working with. Update your light near the door and change the fan to a new chandelier. Then think about what colors you are drawn to, that coordinate with the rest of your home. Choose your furniture and rug before you decide on wall color. I'd look for a bed with a tall headboard that doesn't require a bedskirt.