I meant to make my post in the Show Your Artwork Thread, but instead I posted it here without realizing it. :derp: But I appreciate the feedback! I'll be responding to the points you make in order, to clear up any confusion that would otherwise arise (being autistic, giving people the wrong idea is something I myself do often and unintentionally :ohdear:)
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I see what you mean in regards to animalization. I know some things I could have done to make them look more animal-like, but you can see the reasons in the dA desc if you want to see them.
As for the chubbyness, I guess it's just a case of one man's middleweight being another man's chubby.

I see what you mean about the breasts; that's easily fixed.
Also, I'm not offended by your feedback. Considering this forum's culture, your feedback is actually rather gently worded.

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Agreed she should look like a little girl, but for the best result I had to make her an adult xD
I could have made the frog girl look more amphibian, true. I think I know what you mean and exactly how to go about making it more obvious she's a frog monster.
Designing penguin girls is hard :V I had some design choices to make her look more like one, but couldn't go through with it due to lack of time.
I think I see what you mean. Human upper half, monster lower half, right? Though it's different for some kinds of plant girls...
I'll consider putting that book on my to-buy list once I get to the right point. Thanks for the suggestion!