Even if the humidity is ok, not all sheds come off in one piece. You can try to make a humidity hide next time with a little bit of damp moss under his favorite hide when he goes opaque, or bump the ambient humidity up just a little bit. If his head looks clear (as in it looks like it's shed) he should be okay, and if there's something left over, try a lukewarm/roomtemp soak or wait until his next shed to see if it comes off.
If I'm forgetting something, I apologize. I've been awake for 48 hours and am running on coffee fumes. I just wanted to reply because sheds are the one thing with my pythons that I still occasionally freak out about, so I can empathize.
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