Hello there! Such a cool knight here! I would play around with the character's proportions a bit, since the design feels a little too uniform. I would also make a small change to the pose, such as the arm holding the sword, to give the character a bit more personality. :) What I did was make the shoulder pads a bit larger and reduce the size of the helmet. In my opinion, this gives the character a slightly more appealing appearance. :) I also shortened the lower part of the armour around the torso a bit and lengthened the lower garment. I also added a "collar" to prevent the helmet from looking like it's attached directly to the armor. Hope this helps!