I like the way that the different eva units all look diffrent in some way, such as the colouration or the head design. That excludes the mass produced Evangelions.
I also like the way the characters expressions are drawn, and the fact that the faces can display so much or so little emotion. Also, the way that Rei's smile was drawn, especially the version featured in Death, made that particular smile she made seem very special, as if she had never smiled that way in her whole life. It was one of the rare moments where Rei looked completely happy, the smile seemed so sincere.
Some of the faces Shinjii made seemed very expressive too, almost providing us with a small window to glimpse his thoughts and inner feelings with, such as this shot here:
I also like Sadamoto's drawing style a lot, in the way that he does not use computers to create the art, so more traditional art mediums such as pencils and inks can be put to good use. They also have a very pleasing look to them overall.
One of the parts of the drawings that I did not like was this shot from the OP:
His nose is much to pointy, it reminds me of a rose thorn. I also dislike the fact that from time to time, the torsos of some of the female characters, especially those that wear plugsuits, appear to be too long to look even remotely realistic.