it is smooth and detailed with all of Noivern's different body parts broken down and examined. Crest, tail, claws, fangs, ears, eyes, wings, feet, etc. They all get drawn separately with notes to show how much work goes into each little detail in the design. Also, there is just a simple front-shot, back-shot, and head-shot of the pokemon.

The leaks however are a big, jumbled mess.
The pokemon are not broken down into individual details. Instead all of the space of the concept sheets are taken up by pointless poses that just seem strewn all over the place
.
The biggest offender though is definitely the litten evo leak. It see to have a nice chunk of the sheet taken up by outlines and rough sketches of situations you would see in some kind of slice of life anime. People heating a kettle with his fire belt while he's sleeping, him smacking another pokemon with a table. I mean come on, why would that kind of stuff be in concept art? And why is ash there with his pikachu? They would not put human characters in the concept art for a pokemon, that's just silly.

I'm sorry guys but it just doesn't look real, and you should avoid getting attached to them before they are officially revealed. You're just going to be mad if it turns out they aren't real.