The above is a list of popular ways to do Spinosaur heads, and all are wrong except one.


The first was back when no one knew what a spinosaur was,and didn't know how it's skull looked.

The second is how a spinosaur skull is actually like (more or less) ,and is based on. They have a notch on both the lower and upper jaws, and their muzzles are pretty thin.
http://img.timeinc.net/time/today_i.....ny_0713_01.jpg
They also don't have a whole lot of teeth, but the teeth they DO have are long and conical,and great for stabbing and grabbing onto fish.
http://upload.wikimedia.org/wikiped.....ll_steveoc.jpg

Spinosaurus has a small crest on it's 'forehead'

The third is Jurassic Park 3's version of spinosaurus, which has a thick,wide, and very toothy skull, and seemed to be based on either an alligator or a crocodile,rather than a spinosaurus. JP's spinosaurus was wrong in alot more ways,including a sail that is like a dish,rather than goes completely down the body,even onto most of the tail,it also had pronated hands.


The fourth spinosaurus is primeval's spinosaurus. It doesn't have a crest,but spikes on the back of it's neck. It does have very long teeth though,and is slightly more spinosaur-like than JP's,but still too wide. It also had pronated hands and really weird legs.
Primeval's spinosaurus also has a sail like a dimetrodon.

Spinosaurus did NOT have thin rods with flesh between them,as a sail, this is a hugely common issue with art of Spinosaurus.
http://www.primepedia.de/images/PRI.....pinosaurus.jpg
It looks cool,but isn't a spinosaurus' sail

vs the real deal (more or less)
http://fc04.deviantart.net/fs71/i/2.....an-d4lvufc.jpg
based on other spinosaurs.