First critique I've ever done, dont judge me if its bad...
First of all, amazing drawing. I love the shading and depth and detail and everything. Having his hoof on the Crystal Heart (at least I think that's what it is) was a good touch. However, I do admit he looks somewhat feminine. It's not so obvious that it makes the drawing bad, but creating a more masculine tone would help it become better. The background is fantastic. I noticed that there are stairs in the background, alluding to his apparent obsession. Overall, great drawing. 4.8 stars overall. Keep it up!
Haha, this is waaay too adorable for a 'tyrant ruler of the Crystal Empire'. Most fans are used to the small mare nose and squarer stallion noses used in the show.
I can't be entirely sure what was intended, but here's a thought:
It should be noted that this small nose and relatively large iris creates what I suggested - something that looks rather cute to a lot of people. If we truly want something that looks fearsome and tyrannical, it may be worth considering using larger nose and a smaller iris or smaller eye. A larger nose is seen in adult humans while infants have smaller noses, thus the usual stylization of shrinking the nose but exaggerating the eyes which creates a cute appearance. A smaller eye and a smaller iris is more difficult to relate to as the usual reason why something would have proportionally small eyes is if they are a really big, dangerous animal like a lion.
We could also consider a longer neck as I'm more used to seeing legs are are just half a pony's height. A longer neck also gives us a smaller head which makes this guy look bigger and more menacing.
What I find pretty impressive here is the lighting though. It feels convincingly real. Although... what's causing the highlights on some the King's greaves though? Doesn't make much sense, but probably a minor one as removing them wouldn't be as interesting.
We could also make do without the spike next to the King's foot as they make his back leg a bit difficult to make out. That leg also appears a bit thicker than his other back leg though, just an observation.
Overall, a beautiful piece that may or may not have made the right impression on people due to the proportions which the artist went with.
Ooooh, I like this a lot. Perhaps it's just me, but this seems like a younger Sombra; perhaps when he first came to power? The shortened snout and large eyes may make him look "cute" or somewhat feminine, but honestly, I think it gives him a little more...relatability? I'm not sure if that's the best word, but my point is he seems troubled, and that adds a level of depth to his character that we don't see in the usual portrayals. His expression hits me as one of grim acceptance (perhaps because his eyes are staring at nothing in particular). He seems lost in thought, yet determined. But possible rambling projection aside, this is absolutely gorgeous work. Your command of lighting has me always in awe.