I'm glad you took the plunge; first let me say, it looks like you did a great job for your first time.
Mind if I make a few suggestions after looking at your set up? I think there are a couple of things you could do that will help with comfort in your hammock. First I'd add a ridge line to the hammock, it will set the sag for you. It should be about 83% of your hammock length. You need to use something tough like Amsteel or something similar. A lot of people use a product called Zing It, it's tiny but super strong, another dyneema rope. This small addition will make it so no matter if your suspension is at the perfect angle or not, your hammock will always be. Try to get your suspension to the trees at a 30° angle, use your thumb and fore finger in an "L" shape to check the angle. That forms about a 30° angle and makes an easy gauge. Last thing, set your feet slightly higher than your head, it makes it easier to stay in place in the hammock and makes you much more comfortable. This illustration might make it a little easier to see what I'm talking about, there's several other good tips on it was well.
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The last thing I'd suggest is something that will make your tarp last much longer and be much easier to pitch. Add a full length ridge line to it with prusik knots and clips to hold the tarp, just paracord works great. It will make your set up much more versatile and you're not putting a ton of strain on those center eyes, that always seems to be the first place a tarp starts to come apart. Let me know if I can help in any way, I'd be glad to. From one side sleeper to another, once you get it right and can repeat your pitch, you'll never go back to sleeping on the ground.