As Teacher said above, Fred Bears Field Notes is a good read, as is Fred Asbells Stalking and Still Hunting. He's got a lot of interesting tips about ground blinds.
I build my ground blinds high..like almost chest high. When I'm sitting in them, I have to kind of sit up straight to see out of them. I like it to where its only the upper half of my head exposed. And I keep that camo'd pretty well.
I also like to build them under trees that have some low hanging folage. That way you are in a permanent shadow. Big cedar trees are perfect for this..you can kind of cut out a cubby hole. Make sure you trim up anything that your bow limbs could hang on during draw or release.
Use mostly dead stuff to stack up, that way it doesn't collapse over the course of a few days when it begins to wilt.
Make sure you got plenty of back cover to break up your outline.
When a critter does come along, move only your eyes, and don't look them in the eye! I believe animals can honestly feel your presence when you are under 10 yards and under. Especially the big old does and sows with babies.
If you aren't comfortable shooting in the seated position, build your blind higher so you minimize movement when standing.
And dont be afraid to use face paint along with your hat to help break up the outline of your head and kill the shine off the skin.
Good luck! I bet you won't fool with any elevated stands after your close encounter with a biggun!