Pex tends to leak immediately, if its going to leak. I'd pressure test it if you want to be confident... this would probably require draining your house of water though, then you can use a compressor to run pressure through all the lines and see if they hold the same pressure overnight.
If you don't want to go that extreme (I usually don't, but I'm confident in my pex abilities), then the key thing is to get WATER to all of the fittings. If you haven't opened up the lines to let water through them, you just have pressurized air in there, which is harder to detect a leak. Make sure its water all the way through all fittings, then let it sit overnight again, if no drips you should be good to go.
None of the shots are very close up of a fitting, but you should have about 1/4" between the edge of the crimp ring and the end of the pex pipe onto the fitting, which should be cut very straight and inserted until it can go no further.
Also, if you don't have a Go NoGo tool, you should get one and check the outside diameter of the crimps to be sure they meet spec.
If all of this is good, then the only thing you have to worry about is those damn sharkbite fittings. I have no trust in them. Make absolutely sure that those things are seated all the way in and that there's no sign of moisture whatsoever around them. They're a PITA.