As far as realism goes, Logan has gone above and beyond in terms of the action, fight, and even violent sequences. And part of that is the work that has to be done to accommodate every slashing, head slicing, and blood smearing that happens on the camera.
You would think that, compared to the earlier X-Men movies, the makeup would be a lot easier to achieve given that this is Wolverine and Professor X taking the front row. However, sharing with The Verge, Oscar-winning makeup designer Joel Harlow discussed that one thing that they had taken into account is that he would go a different route that the earlier X-Men films.
"Having seen all the X-Men films, I went into this with a perception of what I thought it was going to be—that we were going to have to fall in line with the aesthetics of these other films—but Jim [Logan director James Mangold] made it very clear right off the bat that this was not one of those films., this was its own entity."
This is also the explanation why the multicolored world seen in Apocalypse was pretty much erased and muted with the kind of palette that Logan has.
It also includes the grounded realism of the blood and gore, which Harlow also had to ensure. With all the head-slicing going on, everything has to look very real—down to the slackening of the jaws as they hit the ground.
"There are films where you can go overboard, and create visually stimulating characters that do give you pause and make you take a second look, and appreciate the art in them. This film, the art is appreciated if you don't consciously know that's makeup. Then we've done our job."
There's certainly a lot of realism going on in Logan, and it's one of the reasons why the R-rating stays. Not that we have any complaints about that.
Logan is currently showing in theaters, and it stars Hugh Jackman, Patrick Stewart, Boyd Holbrook, Stephen Merchant, Richard E. Grant, and Dafne Keen.