Pictures and background lost after address change

I have just uploaded my online shop to the web address https://www.missgreenpartyqueen.com which had been hosting my blog and a static front page previously. The web developer told me to change my address for the blog site from http//missgreenpartyqueen.com to www. as the two sites were competing. When I did this it accepted both sites but now my blog does not show up the background or the pictures. All the posts are still there though. I hope someone can help please? Thanks!