Good day Gregorya, not Sifu level but average Marc student. You ask for critic I deliver my critic as student POV, I hope the word I writing is not too harsh and you can bite it, dont worry there will no curse word.
For some reason I felt like they are looking at same angle but I can see your top 2 attempt to draw looking from below which hit the quota. The character in Digital Circus is much emphasis circular shape but your one look more pointy so it immediately throw off the feeling of similarity, which is the concern why I feel not right. So you might need to improve the copy paste skill eh, don't worry about not using reference since even Hirohiko Araki (JOJO artist) use reference all the time when drawing.
But we are here for facial expression, overall I can sense the multiple layer of despair of character in crazy world, I can feel unfair, creepy crawling, threatening, sadness, and distress. The right below corner facial expression teeth might need to work around little or just hide the upper teeth, curved the lip more crescent. Something like below if you like it
The eye do look crazy tho, maybe work a little lower eye lids. Overall the eye and eyebrow work well with character expression so, nice, keep it up.
Btw do you have any art direction you want to follow? Like draw like Rob Liefeld or anime style?
Looking forward to your 30 days art my man, keep it up.