Eyyyyyyyy not bad! The one thing i notice the most is that the nose bridge seems kinda broad, though that could also just be the reference, iunno. Also, eyes seem too wide set (there's more than one eye width in between them), a bit too much for it to just be the reference, though i am well aware that eye spacing varies on actual human faces.
DAT Knight. Just oozes attitude, I like! Got any more like it?
THANK
Alas, i don't often draw full plate armor; i think the only other one that counts would be
this, although
this dinoguardbro is also pretty armoured, and then there's
this doodle from two years ago that i never posted because i wasn't happy with it. Besides those, not really. :v
Not bad at all.
A few things you might want to consider are (Minor details, that said) :
- tightening the breastplate around the waist a little bit (and maybe adding a belt?)
- compressing the fauld (hip piece) so it reacts better to his leg (those things are made to be flexible, might as well take advantage of it)
- either flaring the cuffs of the gauntlets out even more (if you want hourglass-style gauntlets), or tightening them completely (if you want more of a Gothic style)
- lengthening the blade (or shortening the handle). Right now, you have an arming sword-length blade on a longsword-length hilt
- having the mail gorget fall over the breastplate instead of under (or a plate gorget)
- adding projections on the outer sides of the poleyns (knee protection) and on both sides of the couters (elbow protection)
If you want some references, Knyght Errant has a pretty good late 14th-early 15th century suit of armour and has made an extensive set of videos about it (and some other styles, notably in the helmet department) over on youtube
Other than that, pretty good 
AAA FEEDBACK, VERY THANK
I almost figured that someone who actually knew about armour would come along eventually, because as you've probably already guessed, i know jack shit about the finer details of it. Very helpful notes, i'll definitely keep those in mind next time i draw a(n edgy) knight. c:
in the meantime, however, i maked a thing
i framed rudolph for the crime of drinking on the job (and used it as a gift in a gift exchange, recipient seemed to like it)
