How crooked can you crimp pex rings?
Your crimp ring looks good to me as well. It takes a lot of crooked to make a pex fitting leak. I've only managed a leaking pex fitting once, but I'd say if you're more than about 10 degrees off, you risk leaking.

However, for future reference, when I'm working in tight spaces where I'm concerned I might cause a leak, I use sharkbite fittings. While they are expensive, they are easy to add on and do not need a crimp tool. Sometimes it is difficult to get these large crimpers in small spaces and crimp straight. The cost of the fitting is well worth it if you prevent a leak.