Only thing I can see wrong with that, is the seal looks upside-down. There is a hole in the rubber dust boot that is supposed to be at 6:00 for any water to drain before it gets a chance to get past the inner seal. I've seen them installed like that with no ill-effects though, so just letting you know for next time.
As far as the T-case seal, you gotta watch, because some seals are just supposed to be flush, and don't have a step or lip to stop them. So it is possible to press them too far inside. If it's close, and currently not leaking, then you should be fine though.