help! all of my images disapeered!

Hii!! Im new to html and I had all of images on my profile uploaded through imgur. And it stayed up for about a month, but now all of them have disapeared! How do I attach a picture and have it stay? I thought I had them embedded correctly but clearly, I dont know what I'm doing. Should I changed my host server to be dropbox?

Please halp!!!!! :D