These are pretty good, but I do have to say they aren't amazing. You have potential, but I have to say they need some work IMO.
The one thing I notice throughout these pictures is that the lighting, while maybe better than Minecraft lighting, looks a little... Off. It just looks weird in some places.
Let's take the first picture with the two people fighting. The sun is in the back of the picture, so naturally, light will not pass through blocks. However, some blocks on the side of the building that shouldn't have sunlight are lit. Most people likely won't notice, but I do, and some other people might.
The shadows of the players as well are going inwards towards the middle of the picture instead of outwards.
I do have to say as well that them holding the weapon with both hands looks... Really... I dunno. It doesn't look right at all. Just imagine someone holding a sword like that with both hands overlapping each other on the handle then attempting to swing it. It wouldn't look or feel right.
The players do have shadows on the ground, but not on themselves. The one side of the body isn't 'darker' than the rest and it makes it feel like the light is all around them.
I think I covered the main points here. I hate to nitpick at your work, but if you could improve your lighting/shadows and maybe the way they hold the weapons, it could be amazing. Just trying to give some constructive criticism.
I will also say now just in case - No, I'm not capable of making anything better. I have a opinion on what's 'good' and how to make it 'good'. I do not, however, possess the ability to know how easy it is to do or even how to make pictures like this.