how come.. the trees are so green and there are leaves on the ground like in fall season...) and one more thing.. tropical plant doesn't match the broadleaf maple trees...
very poor materials, for all leaves needs to add translucency. asphalt is too reflective for that mood, why autumn leaves when all greens?
Use reference photos when creating scenes. If realism is what you're after, study how the light interacts with objects and materials. Then replicate it.Also work on composition. In my opinion, the composition itself has a very "3d feel" to it.