Other than answering for paint color advice, I think this is one of the hardest questions to answer.

I only had a couple of inherited pieces on my walls when my kids were babies. I went to a lot of garage sales, etc. One piece of art I got is worth some money and I bought it for $3.00. :)

Concentrate in the public areas first. Look online. You also don't have to have paintings. Decorative plates hung, mirrors, other types of "wall art." I've even framed a couple of greeting cards. I'd buy cheap frames from Walmart and spray paint them.

I'm partial to watercolor, drawings and prints, not oils.

But it took me years to collect all my stuff. Don't rush filling up your walls. And never put up anything that you don't love.

If you celebrate Christmas and exchange gifts, tell your family you'd like things to put on the walls, and tell them your decorating style. Be specific.

Good luck!

When DH and I had our first home we had little for the walls at first. A couple of the first framed pieces of 'art' we had were a promo at the grocery store! LOL Along with about another 1/2 million people! Later the frames did come in handy for a craft.

Best advice, take your time, buy only what you like, and don't ask for gifts but perhaps suggest monetary gifts or gift cards so you can choose what you like.

Should you "do paintings, photos, mirrors"? Yes to all of those but there are also other things such as architectural pieces, wall shelves with personal/hobby items, fabric/tapestry hangings, and self-made art which doesn't have to take talent. Almost anything can be framed so check out your creativity for a personal original. For ideas or unique art check out etsy.

By the time we had been married 10 years we had quite a lot of art/wall decor and now 40 years later I have run out of wall space and am in the process of editing so I can buy more!

thank you so much, i've been living with "empty walls for a few months so i must resist the urge to just fill up that space... i don't want to compromise and only put up things that i LOVE:))
thanks!

I would get some document with shades of the sea or the seaside, and make little starfish, seafood, dolphins, shells, etc, and put it on the walls! If you didn't want to do that, I would recommend going to a art shop, purchasing some of those shells and then put them around the home, where you think it's appropriate.
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In my early days, I would buy stretcher frames and cover them with fabric as a way of warming up a room and getting something on the wall. It's very inexpensive and you can buy remnants with colors that reinforce your scheme. It's a way of making a "place holder" until you're ready to put something more special in the spot.

I understand the large walls issue well. We are still filling ours after 6 years.

Your powder room is taking the form of elegant with the dark walls and ornate mirror, sconce, and towel bar.

Is there a type of art that you are drawn to?

How about a couple of shelves over the toilet?