Stuart, were you woried about painting the grass?
Looks good.
Another tip that I can give you is for setting up your gun;
I usually take a large piece of cardboard or plywood to use as a template for setting up the spray pattern and flow rate. A few swipes across with the gun as you make your adjustments makes it easy to have the equipment ready to spray.
Be thourough when cleaning your spray gun as well. I usually use some laquer thinner to clean my guns, its cheap and easy. Place a rag over the end of the nozzle and pull the trigger to back flow the thinner through the pot and all the tubes etc. I do this at least once and empty the contents and then do a second time before tearing the gun down for a full cleaning.
Your piece of cardboard makes a nice backdrop when you spray out the solvent as well.
Pay special attention to proper disposal of all your solvent soaked rags, cardboard, towels etc. I place all my old solvent into a sealed can for waste disposal and put the rags etc right outside into a steel dumpster.
No fumes, no fires.