Proper sight picture for EAA Witness .45?

1) is "bullseye" best for shooting standardized targets at standardized distances. Usually not used on fixed sight guns.

2) is "combat" usually the way most non-adjustable sight guns are setup for the ammo the factory considers "standard".

3) is abomination.

In any event, you want a plain black rear sight as your eye's focus needs to be on the front sight, anything on the rear, while popular these days, is just a counter productive distraction.

I fill in the rear dots with black paint if the pistol has them.

My fixed sight EAA 45 was set up #2, as I believe my adjustable sight Elite Match was out of the box.

OTOH my Kahr CW9 seems to be half way between 1 & 2 at 10 yards.

As jawman indicated, #1 is kind of unworkable where distances, and target sizes, vary. If I go from aiming at the bottom of a 9" circle to the bottom of a 12" circle without adjusting the sights, that's not going to work very well.

I like my guns to group right on top of the front sight.

My Witness .45 grouped very low. I replaced the rear sight with the highest one EAA had to offer and that did the trick.

JMO,
Given the sights are aligned:
#1 works perfectly on only ONE type/size of target. Change the target and you have no POA, just a shooters estimate unless the sight is realigned.

#2 and #3 are "consistent" on any target at any range

#2 has a better view of the precise POA for various targets, especially small targets or those that appear small due to the range.

Extreme example: Stand a 12 gage hull at a slight angle on the 25 yd berm. Which "sight picture" shows a point of aim that will let you see AND hit the hull?

I use #2. Just repainted my rear sights so I could see them. I guess it's all in what you get used to using.