This artwork reminds me of my childhood books. The whole thing of living inside a tree, with unreal beings and tools, instruments, etc. To be honest, and as I read on your description, this could be an illustration for kids books.
As far as your skills, drawing and coloring. I have some trouble seeing when the floor ends and when the wall begins. The creatures in the image still need more details. I really liked the idea of the flowers as a horn and lights. They seem well fit in this picture. Your coloring skills are great, but still need to work ore on the shadows and lights. The perspective is not totally wrong, the upper level of the tree seems to be out of context in relation to the lower level.
Thank you so much, its really good to have some objective feedback. I see what you mean about the shadows, although, there isn't a back wall, it is meant to be a flat tree stump, maybe if i add some more shadows behind the pillars holding the lights up it will be clearer. Thanks again