Basically, Don pointed out that his head looks a little big and thinks that it could be swollen, I am unsure of this. personally think his head looks fine. he is one crazy snake though lol ;)
To me it looks perfectly normal. I noticed some of them have heads longer but slimmer and some of them short and chunky. I personally like the one of your picture. One of my females looks exactly the same. She is young though and it may change with age.
I do see what he's on about, that is a big head :/ Not sure if that's swollen or just natural to be honest, if he's not shown any difference in attitude it's probably just a fat head ^^
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Sorry about bad pics quality but I've just taken them with my phone in poor light. She is due to shed so I didn't want to stress her out but as you can see her head is quite chunky too.