Douglas,
I think you need to tighten up your space a little. I took my Georgia CDL skills test at a third party tester about 5 years ago, and the space allowed was 10 feet longer than the trailer(or straight truck, in your case), and 12 feet wide.
Your space looks a little too long, but mostly it looks too wide. When you're parked you should be closer to the cones on your right side than you are in the photos.....Your truck(as pictured) is still outside the "parking space".
Georgia no longer uses third party testers, so things may changed some. Since you're in Tifton, I assume you'll be taking your test in Albany. Try this link:
http://www.dds.ga.gov/locations/dllocations.aspx?csc=40
It might be good to do as FolsomFlash suggested and ride over there and watch some other drivers take their tests.
Have fun