Image sizing on mobile: some too large some too small

Hey guys,

I have an issue with making a responsive and mobile friendly website. Some images display too small and some images get too big and spill out on the edges. I am hoping to figure out some custom code to fix this issue since the images are a good size on the desktop version. Would really appreciate the help. The website in question is:

beige.style

Thanks so much in advance!

@Paul2009 @justin1024@jasonbarone @eanderson @BrandonW