I’ve used the wp-jQuery-Lightbox plugin for many years now, it makes images look nice on wordpress and effectively creates galleries out of individual images embedded in a page.
I’ve become a little complacent in recent months though, given that Jetpack enables pretty, nice, lightbox galleries; it doesn’t however do this for individual images. So wp-jQuery-Lightbox is a must.
Once installed. The only option I check is: Shrink large images to fit smaller screens, which makes it more compatible with mobile devices.