Well, as we can see the skins are getting much better - BF is improving and sadly because it was one of the first skins made, it doesn't look as realistic. I know that KK made a reskin for it though, if you'd like to try that.
Also, it is realistic to have them not go underwater...the majority of time a croc is in water, its eyes and nostrils are still visible...that's why mother nature put them there. I'm sorry, but I just went to about 20 sites trying to prove you right, but not one of them said that they are usually completely submerged. If you find a site though, please post it as I would be extremely interested in it.
Bengal, have you tried the tanks/land then? If not, do so and see if you have the same problem. 
I think you are misunderstanding the placement of the eyes and nostrils. They are placed their for conveniance while
hunting. Saying crocodiles of any species spend most of their time at the surface of the water counteracts the entire reason they evolved nictating membranes on each of their eyes; These membranes protect the crocodiles eyes while it is underwater, something it wouldn't need if it remained at the surface for the majority of its time.
This also defeats the purpose of the highly specialized four-chambered heart, which is quite possibly the most advanced heart in the Reptile world. The heart specializes in oxygenating the blood, which allows them to stay completely submerged for up to two hours. They also have the ability to slow the beating of their heart, another trait used to stay underwater for more than just a few minutes. A crocodile wouldn't have evolved these things if they spent most of their time at the surface of the water.
You can't forget about behaviors, as these are just as important as any physical trait. When a crocodile feels threatened, in any way, shape or form, they aren't going to splash noisily into the water just to give away their location by staying at the surface. They are going to drop to the bottom of whatever body of water the had enough time to splash into, and wait for up to two hours until they feel safe. They also sleep underwater for an extended period of time, as sleeping at the surface is something a crocodile is smart enough to know not to do, and sleeping on the river bank can be just as dangerous as sleeping at the surface. Nothing is safer for a Nile Crocodile than a large waterlogged tree on the bottom of a river.
I feel that people tend to believe crocodiles spend most of their time at the waters surface, not that they do, because it is such a unique behavior, backed up with unique placement of the eyes, ears and nostrils. It is a popular behavior because every animal special on T.V. or every "scientific article" on the Internet feels the need to point this fact above all others. It is just a glorification of a physical trait used in hunting, as well as gaining oxygen. So, a crocodile would really need to return to the surface every one or two hours, then drop back down. Also, a crocodile will only hunt when it is hungry, and seeing how it is an ectothermic animal, this occurs anywhere from two to five times a month.
I hope i got some sort of a point across. You can check all the 20 websites you found, and you will see that everything I mentioned is what Herpetologists are currently believing in terms of crocodilian behavior. I also hope I didn't write too much.
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