Would suggest reading Barbara Hambly's The Ladies of Madrigyn - Hambly is a black belt in... I think karate and a trained historian. She does a very interesting set of scenes on a large male mercenary giving women fighting lessons. A lot of subtle points about size, strength, centre of mass and attitude.
Also, I used to do epee fencing and that is an eye opener on the impact of physique and mentality on fighting style.
I would also note though that there could broadly be said to be two types of fighting - individual and group. Fencing, and from what little I've seen of eastern martial arts (as in karate etc) is all about the individual fighter - with advanced eastern martial arts having individual taking on multiple assailants. In epee a lot of what you do depends on mobility and responding to what your opponent has just done. But what you don't have is teamwork fighting - as in what an army does - whether it is close quarters infantry with swords all staying shoulder to shoulder, or modern platoon covering each other as they take turns moving.
As a reader, I like fight scenes that are in part in the characters head - as in commentary. Little bits like "so glad I stopped to put my armour on", the emotion of the fight. Pure bash, crash bores me. A matter of taste, but I am also not a fan of what I think of as "rock, paper, scissors" fight scenes where there is an extensive running commentary on the relative merits of different weapons. A little bit - as in decide to pick an opponent with a weapon you could beat, OK, but not an extended discourse on the merits of every weapon present. To me, too much exposition is a bit like having a pause button - the fight starts, the narrator presses the pause button for a documentary on weapons and fighting styles and then unpresses the pause and the fight continues. If you are up on a castle wall, surveying the incoming army, yeah OK, but not when you are in a melee.
Another thought is the level of expertise of your fighter and experience of scrapping - which is not quite the same thing. If you are used to fighting in a practice room in a controlled environment, being attacked on the street would be a different experience. Separating out what is going on, and then reacting to it takes practice. So for a beginner, the fight would go by in a whirl of pictures - face and fist coming towards him, managed to duck, where did that go, oh *** where did he come from but for an experienced person they'd be picking up on who is the most dangerous, is that person lurking by the wall part of the opposing team and about to mix it or not....