pictures disappeard of mixed up

Hello, my site is myfeetaremeanttoroam.com Since I changed themes, my pics in the different articles are all mixed up or even disappeared, except the ones in full size. Example: myfeetaremeanttoroam.com/white-villages-andalucia-top-5/ Other example: myfeetaremeanttoroam.com/camping-in-the-cloud-forest : the pics that I want to place one next to another keep on being displayed one beneath the other. I ran the "regenerate thumbnails" plug, which didn't help. Any idea what I can do to get the images in the articles back the way they were in the previous theme without having to go through each article again. Thanks in advance Els