Post Main Image – Not Full Size

My post images show up as thumbnails almost. I dont’ think it’s a theme issue, since I’ve visited several pages with the same theme, and no one else is experiencing this. Likewise, the theme forum doesn’t have any questions that touch this.

I’m using Fashionista Child theme. My site is blog2.culturegrab.com

I”m a total newby, so any help you can offer would be more than appreciated. Thanks so much!