Digital Artworks - Feedback

Ok. So finally I have something to have Feedback on. After mystical Orange I did these few artworks. But I would love to know what anyone can find lacking or how it can be improvised. If anyone can guide me about lighting or how to add more realism. It would also help.
The artworks are somewhat final and if anyone feels something needs to be added, touched up or changed so that it becomes better than what it is. It will surely be done.

All these are purely done by imagination with no references whatever. That’s why even the mushrooms I made might seem practically unrealistic. But feel free to comment on the same.

Overbridge - A war torn area where serenity is just beyond the corner

Tiny village of Mushrooms

An empty village house filled with sunlight