I'm with Alsatian.

One of the most important things IMO is to have a solid shooting platform/rest at the right height for you. So you don't have to scrunch up and can shot comfortably from a rest. Shooting from a rest really improves anybodies shooting, if you are using a rifle.

The remainder of the blind really doesn't have to be a solid wall, the main function is to break up your outline and it really doesn't take all that much. If you need a wind break, it only needs to be on one side.

If your head is showing (for most animals) it really doesn't mean much, if you don't move. The vast majority of animals (with a few exceptions) see motion, they don't really see form nearly as well. Your light colored face jerking around really stands out.

I make my ground blinds without a roof and wear my weather protection. Light weight, quick setup and transportation is more important to me than building a hut.

A rotating stool, that is quiet, is a big plus.

I think ghillie suit when making a ground blind, but don't over do it.

If you don't move, most animals are going to get way close, if they don't smell you or hear you. If you don't move, you aren't making much sound. Not much you can do about your scent, except to try and minimize it. Scent is a strange thing in animals, they are likely going to smell you, but their brain might not scream alarm, some flee at the slightest scent of human, some don't. IMO strange noises or motion can spook them quicker in many instances. I've had them bolt at many yards away from the click from a safety or a little thump from laying my rifle on a wooden rest. Birds can be the exception, they tend to see any motion, color and form a lot better than most ground animals.

I've had Deer, Hogs and Fox get really close to a ground blind that didn't cover much more than a very scanty bush would.

I was told a great portion of a Deers brain is dedicated to their sense of smell. Deer are generally stupid, but can smell like a blood hound. Any scent that is unusual or different may spook them, cover scents and other stuff are just another scent. Whether that other scent is going to mask your scent or just spook them is a crap shoot IMO.