Hadith - Bukhari 3:428, Narrated Said bin Abu Al-Hasan

While I was with Ibn 'Abbas a man came and said, "O father of 'Abbas! My sustenance is from my manual profession and I make these pictures." Ibn 'Abbas said, "I will tell you only what I heard from Allah's Apostle . I heard him saying, 'Whoever makes a picture will be punished by Allah till he puts life in it, and he will never be able to put life in it.' " Hearing this, that man heaved a sigh and his face turned pale. Ibn 'Abbas said to him, "What a pity! If you insist on making pictures I advise you to make pictures of trees and any other unanimated objects."

Hadith -Bukhari 4:47, Narrated 'Aisha

I stuffed for the Prophet a pillow decorated with pictures (of animals) which looked like a Namruqa (i.e. a small cushion). He came and stood among the people with excitement apparent on his face. I said, "O Allah's Apostle! What is wrong?" He said, "What is this pillow?" I said, "I have prepared this pillow for you, so that you may recline on it." He said, "Don't you know that angels do not enter a house wherein there are pictures; and whoever makes a picture will be punished on the Day of Resurrection and will be asked to give life to (what he has created)?"