from what i can see from the pic i would say you are moving the spray gun too fast try to slow down a bit
when i spray i use 3-4 500w lights (or summer sun) and as you spray you need to look for the shine once you've seen it you'll know what i mean
if your rollering it on you may want the paint thinner but is a bugger for running
be for putting any more paint on you'll need to rub it down as i think you'll have lost your key