A boring style, I know

[Atelier]

cnc nonetheless? I just started working on a new computer so resources were limited to what I found on google images and a brush set I downloaded xD

[JoShO]

Really dislike the lines on the kid's face, unless that's the stock.
And some of the C4Ds are too obvious, you can see the whole part of the bubble and it looks awkward, like the two on the left and right of his face.

The rest of the effects are good though, maybe too simplistic.

[Maietrix]

Looks a bit dull, I would dodge the highlights and bring em out some more and blend the fx more, also the lines on the face should go, could be dope with a bit of changes. KIU

[Atelier]

lines are part of the stock. haha

[Derosion]

Not boring, just needs expansion, keep working with it. Remove the text and the lines on the kid's face from the lighting above ruins your atmosphere.