This is the new version I've made after receiving the feedback. I made a lot of changes and also used a thinner lines this time (maybe the lines are too thin now?). We now have a background and also a more cozy scarf. I changed the tree a bit and the dragon as well as soften the sharp edges.
Thanks @blamillo for the great ideas! I tried playing around a bit with the sprouts and make them do a bit different things but in the end I wanted the feel of the drawing to be more calm and peaceful so I decided to keep them as they were but give them a bit more personality. I loved the idea of the mama sprout so I added her in the background carefully watching over her kids from the distance.
Please let me know if you have any feedback on it!