okay - here's my suggestions.
Armour right (silver/grey) looks like the plate ends at the nipples, more or less. Bit silly. Take the plate higher up, all the way to the throat. And smooth over the chest. If you want to see how it would look, pull on 3 or four layers of clothing. If you want to see how a tight-fitting plate would look, make that 3 or 4 layers of tight clothing.
You will notice that although there is a swelling at your chest, there is in no way a distinct 'cleavage' between 2 bumps.
Those elbow and shoulder and wrist pieces (in layman's terms) are too showy and will most likely just get tangled in your reins, bowstring and hair.
replace the big lumps of steel with thick leather, and maille over the leather. This can then more or less lie parallel with the body and be flexible.
Less joints on the lower-abdomen piece. Joints are where the arrows go at close range, or the daggers in a scrum-melee. And then you're dead.
From the waist down just fine for infantry, although you clearly have access to enough maille to be able to have maille leggings instead of those cloth... pyjamas?
For cavalry or mounted infantry, take that daft plate away from between the legs - it's going to have to lie along the spine of your horse, and means that the whole skirt of the maille will end up bunched around your hips. Slit the maille skirt front and back so that the armour will hang down over your legs when on horseback.
And, this is a personal thing, coming form a part of the world where rain makes the ground slippery 363 days of the year....
LOSE THE STEEL FOOTWORK!!
a pair of hobnailed boots, if you must with mail or steel plate reinforcement.
That way you won't spend the last moments of your life flat on your back thinking... 'was that a banana skin?'
