Candybooru

Head is too small in relation to the rest of the body, you may want to take that into consideration in the future.

Actually, the head is kinda realistic for a real human model in terms of size. And yes, they are human... It was stated when Paulo was comforting Lucy.

"I'm treating you like a human, not a piece of meat."

'Sides, its a drawing style. No need to say its incorrect when it comes to cartoon kitties, humans... Cat humans, whatev'.

The only thing I could say to improve it, would be to put in some shading here and there. Other then that, the design is good.

I really like the colors you chose for this! It looks gr9 omg, keep it up!

and @Juan_Pablo, who are you to decide what's wrong with Tattleblue's art or not? I think that the proportions are quite accurate, honestly,,
In my opinion, I think that there's a fine line between positive feedback and full-on criticism. It takes a lot of guts to post art online, and I think that you should support them, instead of telling them every single thing you dislike about their piece. Sorry if I sound rude, but I feel like all you've been doing is critiquing, and maybe that sort of concrete feedback could be good for some, but for others it can be quite discouraging.

I swear there was a warning about playing armchair critic before.
The existing line work is actually strong, because the lines bend and show some motion. I'd agree with the other users and say you could definitely shade it, if you want to take the picture further.
When cartoon or abstract artists are too fixated on things looking mathematically proportional, we get stuff like Marge in the 2009 Simpsons intro. You know how to appeal to the human eye, so please, keep doing what you're doing.

I'm looking forward to it, judging by the standard set here.