They could have been there from birth and grown larger into adulthood and you never really paid attention to them. I have done a lot of research on this and found nothing on this sort of thing. Think about what you have been doing. If the lumps seem to be on the same spot on each side of your skull then perhaps you are wearing a bike helmet or if you are male, helmets in sports and it's irritating your skull causing the lump. It could also be bony spurs, but this is unlikely. Any lumps should be checked out by your doctor.
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Just different artistic interpretations.They all signify death , or the contents of a thing may cause death.
Without seeing the graph, I can't provide a specific answer regarding the size of antlers for an elk with a 470 mm long skull. Generally, antler size is correlated with skull length; typically, longer skulls may indicate larger antlers. If the graph shows a trend or relationship between skull length and antler size, you could estimate the expected size based on that trend.
what you have to consider here is that the helmet may keep your skull from cracking or braking. But while the helmet protects the skull as it is stopped suddenly (when you crash) the brain inside the skull continues to travel at 50mph and crashes against the inside of the skull, and this may kill you.
It probably is bone. Your skull is not flat, it has hollows and ridges in it. It could also be a harmless cyst that has developed. I wouldn't worry about it.
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