Helping your child to practice at home will improve their drawing enormously. Setting up a dedicated art area at home can be the best way to encourage practice.
This area should be private, free from prying eyes of adults or hands of younger siblings, and quiet, with the option of music playing in the background.
Access to a clean drawing surface, art supplies, and inspirational magazines, books, and art materials are enormously helpful.
Pinterest is a great source for ideas.
Setting aside a specific time for art-making can help, as well. Every family is different. Do what seems to work for your child. Don’t press too hard to have finished artworks in front of you. Students’ work at home will almost never match the work done in class. The important thing is that they are doing SOMETHING. Encourage that. Try to avoid corrective comments about specific details in the work. Instead, simply describe what you see, and let your child know that you are proud to have an artist in the family!
For more info on the art supplies I use in class and where to get them click the link below.