@Neha-Rawat I really like the concept! I think perhaps you could push the storytelling a bit further by being more specific about where the kids are. Right now it seems unclear and maybe that’s why you feel the background items are forced?
Is it a school room? If so then more educational charts around on walls. Book shelves would be more accessible to the kids etc. things like that. Look for references of similar locations
Is it a family room in a home? Then maybe there would be more homey type accessories.
Is it a birthday party or some other event that’s happening - then maybe the background show this. I think you just need more clarity on that aspect of the story.
The expressions are really fun on characters though - keep going!