I think that if you have the money to make a walk in-shower in place of the tub in the Jack and Jill bathroom, I would do it. We don't ever use the tubs any more since the kids are older (except to bathe a dog), so I think that if a house has one tub, that might be enough. Make the other ones into a tiled shower. But it will be very expensive.

for your master bathroom, I'm not sure of your question. What kind of door for the shower? I would do a thick glass door so the pretty tile is visible and the space is visually open.

Before you take the big step of removing the bathtub, try replacing the shower curtain with a good quality white polyester one. It would lighten the space and take up less room than what you have now. I suspect the window replacement could be costly, as in several hundred dollars because that may have to be custom work.

I would still rather have a door for a shower and not a curtain. I don't think you need the extra decorative curtain for that small area.

https://www.ceramictilefoundation.org/homeowners-guide-to-hiring-qualified-tile-installer

Hire very carefully for this. Lots of hacks out there that do not understand proper waterproofing for a shower. Tile and grout are not waterproof.

Contact a glass company to give you an estimate on a glass door for the master shower.

It looks like your curved shower rod is mounted outside the shower wall. It should be mounted so it's centered over the tub ledge. The shower curtain shouldn't billow like that when fully closed. It might need an alteration.

Do you have a good exhaust fan in the tub/toilet room?

That way-too-dressy, shiny and heavy shower curtain isn't doing you any favors. Quick fixes are to find a lighter shower curtain - I have one in my small guest bath that is a bit lacy with some see-through areas, and is quite airy and floaty-looking. I think I got it at BBB for not a lot of money. I have a clear vinyl liner on the inside, also inexpensive. Change out the shower curtain before you invest thousands in a renovation.

Painting over the gloomy gray wall paint would be helpful, for a lighter color.

Also, 5 weeks that you mentioned is not enough for the kind of renovation you are taking about.

DKNY Highline Shower Curtain in white cotton:

She has a shower door in the master if I read correctly? No curtain over it pleeeeeeze!!!! Aurrrggggghhhhhhh no

Call aocal custom glass place for the master.

glass doors for both.

if you want to take out the tub for the jack and jill, do so. but do glass. no curtains.

this is a small bathroom. removing the tub, using the same floor tile for the shower floor, light colors and a frameless glass door, makes it appear larger

ditto for you master shower. do a door. (i know your plumbing is on the left wall so you can't do a glass panel between the tub like here, but having a frameless door will still give you openness.

On making mistakes: it'll be easier on yourself to allow yourself a mistake budget. If only a few percent of your decisions seem like mistakes, that's pretty good for a first time home owner/builder. That puts a shower curtain mistake in perspective.

Before you change the window over the tub in the family bathroom to an openable one, see if you can stand in the tub and reach where the new latch would go. If not, it's not going to be very practical to put in an openable window. However, if you are in a climate where the window would get opened in April and closed in November, with no security concerns, it may be worth the trouble.

I really like FreidaJune's suggested curtain for the family bath and suggestion to make sure it's a straight rod placed above the tub and not one of those rounded ones that sticks out. Definitely worth it to try that before putting in a door there and/or replacing it with a shower.

If the curved rod is repositioned correctly, the arc will only go slightly past the tub edge so she really doesn't need a straight rod.