I really enjoyed how this turned out.
Honestly, the shading on the armor and how you draw your focus to the center while still using the rule of thirds are what I like most. Though I am a bit sad you didn't use the mountain range as the artist block.
Somethings you might try to improve on for future pieces is possible to do some studies on color usage and contrast since the pencils on the front line are more defined than the horde of artists and your color palette seems like it could be narrowed down to improve the tone of the piece. (I hope you find this helpful and don't see me as just being a big jerk.)
Here is the channel of a speed paint artist on youtube, that I really enjoy, where I, personally, learned a lot about using color
(if you're interested): https://www.youtube.com/channel/UCPa7bvOg_r54NaQb7GJA9Eg
For real good luck with the contest! This is probably my top fav, though I still hope I win lol.