Praise your child's efforts, even if it comes to "Well done, you've got your thumb on middle C...your fingers are curved nicely...you went to the piano all by yourself...you're making a great effort...I love how you concentrate," etc.
New learning theory suggests that only praising the final "job well done" may actually work against your child's success. The thought is that they may, unknowing, conclude that only a perfect finish is worthy of praise, and thus they become more anxious and possibly less willing to "give it a go". 

Learn more about the best piano lessons in San Diego by visiting www.wagnersmusic.com!