I had to get a much longer set of straps for here in the PNW, as the trees are as big as you have in your photos & bigger. One thing that looks off is the angle of your straps, in part due to how tightly they're strung. You want that 30* angle, so that the tension across the bottom doesn't throw your legs up. If you have a good angle, you'll have an almost flat diagonal lay & be about there for side sleeping. You might throw a pad in the hammock itself as it will shield a lot more wind than a poor fitting UQ.
My first few nights were as simple as a cheap closed cell foam pad & inside a sleeping bag.