I lost a shot on a mature buck, mb line was not brushed in and it did not seem to matter to him. What did matter was when he could come far enough around to see the "black holes", just five minutes before he came around I pulled my camouflage screen netting out of my windows. I was going to pack up my blind and go home. As soon as he saw the black holes he bolted out of there. But he came all the way around the back side seen it and not had any trouble, but when he reached the front where the windows were open, he was gone.
I had trouble with my blind before because I was hunting on public land, I brushed in so good hunters walk within about 8 yd. of it before they noticed it was there. You need to use the 50/100 rule. If deer can see 50 yd. you need to be brushed in really good. If they can see 100 yd. you need to leave it in the wide-open.
The other thing you need to be concerned about is what you were in your face and the hand that's holding your bow, I wear black on my face, and both hands, this past time I also wore black fleece jacket. But it did me no good, the Yahoo is that came within 8 yards, came right at shooting time but a half-hour before sunset. They were scouting, for doe hunt in that county the next morning. It was two day hunt.
Another thing that I use with those blinds, is a double bull three-legged stool, it allows me to swivel one direction or the other, it also allows me to get down on one knee or both very easily. The best thing is it does not cut off circulation to your legs, it is the most comfortable stool that I have found. Another thing you can do is put bungee cord from your top eye bolt on your roof down to the stake down grommets. You can use these to put branches and vegetation under them.
Ground blinds are little more work, but they are also a lot of fun when you're looking eye to eye.
Carl