If you look closely at this colored pencil drawing, you will see one of my biggest mistakes....using poor quality paper. I was going through my portfolio this morning and ran across this study that I did many years ago. The paper has yellowed, and is slowly disintigrating. The years have warped the pages with humidity and drying, and the colors are slowly leaching out of it. Lesson learned? Use high quality, acid free paper, stay away from thin, flimsy paper if you want to keep the drawing forever. Newsprint drawing paper is for practice only. Lastly, keep your drawings away from the sun. The UV rays will damage the paper and fade your drawing into nothing!