Great tutorials. I am especially fond of the dynamism brought by the flying debris in the orc portrait and the upward wind in the lich sketch.
Speaking of the lich, it seems in the figure outline that you’ve given him a shrivelled waist. It is a nice touch, but comparatively the rest of the body looks quite healthy. I know it won’t make a big difference in this particular character with the multiple layers of armour, but it might be nice if we could get the feeling that his limbs and neck are similarly dessicated/damaged. Maybe some armour parts are floating a bit which tells us of the lack of flesh underneath, maybe we see the neck, maybe a torn sleeve reveals part of the arm… I think it could add a lot of character to an otherwise mundane silouhette
Also, since you wish to improve in that particular area, I’d say the shoulder pads are neither very functional, nor in line with the rest of the armour (a bland round shape contrasting with otherwise angular plates). Considering your other works, I’m pretty certain that some research on historical armour or modern day replicas will give you a ton of ideas











