All your shadows are too strong and too direct - never would the light source be directly from where the person is looking, rather from below would seem far more natural in accordance with your layer styles. With strength, lower them to around 30-50% opacity, any more and they look wholly fake (like a black glow rather than a shadow) - the only case where thick shadows work is if they're small, around 1-4px.
Background elements need sharpening, banner sides are too bluntly brushed black making it look tacky.
Working with layer styles that give the impression of light coming from below is odd too - unless you fully think all of it through, just go for descending light.

