For a beginner you're doing really well, keep doing what you're doing and keep yourself motivated and you'll see improvement comes quite quickly! The image is a little too symmetrical overall, the grass area is a bit flat. Your linework here, while appropriate, lacks style. The most effective way to create a good visual sense of style with linework is to work with more organic shaped, and to vary the linework thickness throughout. That aside, your colors and composition are effective and the characters expression is fun and well done. I think you have good potential and would like to see what else you can do as you continue to challenge yourself. Keep it up and thanks for sharing!