Could you please host your images in a different way, so e can see them immediately. Look at "Things of importance and interest".

It's a bit of a quibble, but I think that something strange is going on with the person in front. That one seems to have a hole in the spacesuit, which should normally cause the astronaut to be pushed over from the air escaping though the hole (also causing him or her to die, by the way).

Well, my gist was that it isn't legitimate to attack pixel art, or even other forms of art, even though they may be mathematically limited, and hence theoretically have limited possibilities towards creativity. Art, to me, is, in essence, creativity that has results that are not utilitarian. A spite in a game is art, because you could substitute them with colored rectangles, and the game generally speaking be just as playable, as several Atari 2600 games prove. Video games are also, generally, art, because they are non utilitarian. A bridge or a car is not art, because they are generally built to be useful. That's my definition of art, which may not be universal, but that's how I see it. ^_^

Yes, I'm a coder, and I'm glad you enjoyed my math.  But, I don't think that all art boils down to math. However, certain arts, are based on maths. For example, most note-based, melodic music, is certainly based on maths. Most scales of notes were originally based on certain simple proportions between frequencies.  Most melodies an rhythms are based on the progression of certain simple numerical series. Actually, that's why it's possible to generate music with a computer that sounds good. You could try this computer program to convince yourself: http://www.reglos.de/musinum/

Well, I can't quite put my finger on it, but in your original piece, it looked to me as though her right arm was in front of her right breast in stead of next to it. I think that more of the arm should be hidden by the breast. In your last edit, this is the case, and it does look a bit better, although I feel like it should be just a little more more. Also, I noticed in your last edit that you're starting to use "fat pixels", that is, in the outline of the back of the leg and in other places, there are blocks of outline pixels that are thicker than 1 pixel, which looks a bit messy. I guess this is called "banding" in the pixel art community. I found an article that may be helpful for you here: http://www.pixel.schlet.net/

On the good side, the hair and the twinklies are an improvement. So don't get discouraged, keep up the good work. ^_^

Well, the big thing that bothers me about this one is that the pose of the right arm (on the left on the canvas) is completely unnatural, if not impossible. Contrary to Matthias, I do like the alternative, unusual approach you took to the tooth fairy idea, but I can agree with him that you should probably practice on a smaller scale at first until you become more experienced in pixel art.