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The point of mentioning regular mediums in this topic is to try and let you know that you have to possess basic artistic skills before you can apply them in difficult mediums such as pixel art. Drawing on the computer and drawing on paper are only different in the sense that you (if you don't own a tablet) are using a mouse. This doesn't mean that principals such as constrast, proper shading, learning from life don't apply in pixel art, it just means that you use a different tool in a different setting to create them. If you look at a ball, shade it in pencil, and try to make a ball in pixel art, you don't simply forget what you learned about the shading of the ball because you're on a computer. You drew it from life, using it as a reference for learning, and can apply it in different mediums such as pixel art. art is art (as scribblette so well said), whether you're on a computer, drawing in pencil, painting, or even sculpting. You apply the same skills you learn everywhere in art. On a personal note, when saying to people who try to offer you help that you don't care about your art, it is essentially giving them a slap in the face for taking time out of their days to help you.