Nice. I see you followed the tutorial well since I know what tutorial you are talking about. Just need to darken it up and give it more depth into it. Other than that, nice work.
Need to work on the contrast, lighting, depth and quality. The lighting is just too strong while the flowers take away the depth from the focal point. The composition is choppy.
Need to re-size the render better. Need to work on blending and effects. Your composition and atmosphere is nice though. Also need to work on the typography because it stands out too much.
Need to work on the contrast, composition and effects. It's pretty flat because of washed out the colors and everything else looks. It also makes you lose parts of your depth. Try adding some curves, adjustments and whatnot.