My iCloud photo library doesn't seem to be completing the upload sync.
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I've had several clients complain that their iCloud photo library is not updating completely. This seems to occur with very large libraries. It can be frustrating as we have no control over forcing the pics to update. The best strategy I've found is to first make sure your upload speed is very strong on your network by having your computer close to your router or even better, directly connected via ethernet. Secondly, sign out of your iCloud account on all devices. Then resign back in and re-enable iCloud photo library syncing in either Photos preferences or System preferences iCloud preference pane. You can then go back to Photos and in preferences and check to see if the progress has started back on the upload once again.