When I initially showed them my example, there were a lot of "wow"s and "cool" but also a few "that looks hard". One of my students, who has difficulty managing his emotions, was starting to get upset because he immediately assumed that he couldn't draw it.
I kept him by my side when I demonstrated to the entire class and had him help me while I was drawing. Once he understood how easy it was, he ran off and very quickly made a lovely drawing. He was so excited, he made another! He was so proud, he didn't want to hand in his work but we compromised by letting him show his teacher and his Mom and then returning the work to me.
What started as a "that looks hard" and "I can't do it" turned into a "yay, I'm so excited" and "it's the best day ever!"