Once you've reached your target make sure to check the nozzle on the hose for any dry paint or material that may block the flow. Test spray a few dots on the sidewalk to double check. Now the faster you move the better. It will replicate a hand drawn scribe if you are quick and calm. If you go to quick though you'll blow it and if you go too slow you'll run out of ammo.
TIPS: using different ratios of paint, water, and air will result in different types of spray, more paint and water, and less air will give a thinner line. More air than paint and water will result in a larger spray but will run out of paint very fast.