How can I display retina ready images?

Good afternoon!

I’m using Hew to run a photography blog, and so I want my images to be as clear and compelling as possible. As such, I would love for my images to display beautifully at hi-dpi resolutions. Currently, my images are primarily displayed as “Featured Images” rather than embedded within a post.

I’ve installed the WP Retina 2x plugin, but as far as I can tell by looking at the code, it appears that my uploaded photo media becomes cropped and compressed when displayed as a featured image. To my eye, it doesn’t appear that my images are displaying at a “retina” sort of quality.

How might I make the necessary adjustments in WordPress (or in the Hew theme) to display my images for hi-dpi?

For the record, I upload my photos at fairly large sizes, and my “large” thumbnail setting is set to 1024 x 1024.

Thanks for the help!