There are some fast demonstration by my teacher in class, i think he probably spent around 5-10 minutes for each piece.
I got this piece from the teacher. Without any extra, leaving only the simple color, outline and background. It's really nice and I like it so much.
Different vivid color was used in this picture, showing the high contrast effect.
Distant objects usually look blur, no matter in this picture or in reality.
The purple corn makes something different.
Green is not commonly used as a background color as the teacher told us, but he showed us how it would be. I think it's really not bad and quite fresh indeed.