Caster is not a visual aspect of alignment. From the side profile of the vehicle, if you were to draw a line through the upper and lower ball joints, this angle in relationship to the ground plane is your "Caster." Negative or not enough caster makes steering very easy but hard to keep straight. Too much caster makes the vehicle drive very straight and relaxed but hard to turn.
We focus heavily on proper caster angles, with a few degrees increase over stock being the sweet spot. Caster numbers are relative to the ground plane; suspension height can affect caster angle. Ideally, set vehicles up with a level stance. Camber is the angle from the top and bottom of the tire, perpendicular to the ground (Positive camber is out at the top, negative is out at the bottom). Aim to keep the tire flat to the ground for maximum surface area and best tire wear.