Nile crocodiles have a dark bronze coloration above, with black spots on the back and a dirty purple on the belly. They have green eyes.  I will take the reference’s word for that as I do not ever intend to get close enough to check eye color!
The Nile crocodile is a quadruped with four short, splayed legs,  a long, powerful tail, a scaly hide with rows of ossified scales running down its back and tail, and powerful jaws The nostrils, eyes, and ears are situated on the top of the head, so the rest of the body can remain concealed underwater.
They normally crawl along on their bellies, but they can also "high walk" with their trunks raised above the ground. Smaller specimens can gallop, and even larger crocodiles are capable of surprising bursts of speeds, briefly reaching up to 7.5 to 8.7 mph. They can swim much faster by moving their bodies and tails in a sinuous fashion, and they can sustain this form of movement much longer at about 19 to 22 mph.
They normally dive for only a few minutes, but will stay underwater for up to 30 minutes if threatened, and if they remain inactive they can hold their breath for up to two hours.  Now if we could just train them to dive for pearls! 
Their mouths are filled with a total of 64 to 68 cone-shaped teeth. The Nile crocodile is the largest in Africa and is sometimes regarded as the second-largest crocodilian after the saltwater crocodile. The male crocodile usually measure from 11 to 16 ft long, but very old, mature ones can grow to 18 ft or more. Mature female Nile crocodiles measure 7 ft 10 in to 13 ft 1 in. Typical Nile crocodile weight is from 500 to 1,100 lb, though large males can range up to 1,700 lbs. The largest accurately measured male, shot near Mwanza, Tanzania, measured 21.2 ft and weighed about 2,400 lb.