Tracing is easier if you have a light table, but holding the paper against a window works equally well. Assuming you have access to a scanner, the body parts could be scanned into a computer and a paint program used to color the alien. If you have a program that can load gif files the images can be saved directly from the net. If you trace the body parts lightly in pencil, a black marker might be used to darken the outline. All dark colors, or coloring very darkly will make it difficult to see the detail.
Natural objects are usually a blend of a number of colors.
Alien plants, buildings, spaceships or ground vehicles will make your picture more interesting. If you are going to send your picture as an email attachment, your picture will need to be scanned into a computer. Your picture should then be saved using the gif or jpeg format. Sorry, but I cannot promise that all pictures will be posted. Any picture that is put in the Gallery will identified only by a first name and age.