I like the one on the left, I think your maine coon is a bit long in the snout tho. It might be hard to see but I overlaid it with a cat I got on google image here, the cyan line is where the cats face ends in comparison. I know you got more of a stylized thing goin' on but, I still reckon it's a bit long.

As far as the markings go, I think they look alright, although something seems a bit off on how they line up on the head. I think it's cuz if the fur is in front of the ear, and above the eye, then the direction of the fur wouldn't be downward like that.

Thank you, I really appreciate your comment. The snout do look too long, even for a semi-cartoon style, making his face look like more of a dog than a cat. And for the marking on the head I have to confess that I couldn't figure out how to do a face marking, so I just did a random mark... yeah I know, shame on me.

I think you should perhaps round the snout of the maine coon a little more, and maybe make it shorter - s/he looks sort of like a dog. I like the markings, but I don't think they should be quite as thick.

I like the siamese a lot, s/he looks very well done and that's definitely a style you should keep up.

For the kitten, I think s/he looks okay, but I would suggest making the head a little smaller and the paws bigger if you're going for something realistic. For most baby animals, their paws tend to be bigger in proportion until they grow into them. c: