Looks good. You should take a backpack sprayer and hit it with some Arrest this year. Then frost seed 1 more time next year and that'll be a great plot for 5 years (assuming you continue to mow it every year)
You ever throw down some 0-0-60 fertilizer at all? That would help the clover out. Looks good and thanks for sharing. Shows you don't need lots of stuff to get the job done.
I've had good luck with clover in the past. I did however find out from an old farmer and hunter that clover seed is so small that you will actually waste a lot of it hand seeding and using a spreader. He told me to mix the clover seed with sand and it will disperse a lot more evenly. It actually worked pretty well.
Ideally yes a soil test. Mossy Oak Biolgic has a great test for $8 and you got to mail in a half of a sandwich bag of dirt. (Same lab as whitetail institute but cheaper). But the 0-0-60 mainly only feeds the clover and can't hurt. I would check your local farm/seed/ co ops in the phone book and call and ask what they got. Turnips too will benefit from a general 17-17-17 fertilizer but ideally a soil test that will tell you exactly how much you need ( breaks it down per 1000sq ft and per acre of how much to ammend your soil.) I got by for years with out doing a soil test and grew waist high brassicas and turnips the size of softballs on crappy soil but I put enough fertilizer down. Now with the tests I save $ and surprised myself on how good some plots are and what needed work.