The usual mistakes...
1) too low opacity on content area
2) no (such) outer glow on texts
3) wrong use of renders (placement + scale)
4) wrong structuring - look at the empty black area on the bottom
5) lack of content, wrongly distributed - while that one single background image looks good, the contrast to the black bg is too harsh, it doesnt fade out well and that one piece of a picture for the copyrights just looks straight out wrong like that
6) fonts - use normal looking fonts - custom fonts imo are only ok on logos etc. for everything else use, simple default fonts
7) wrong canvas structuring, depending on what you want to design, use the appropriate sizes. I believe your content area looks bigger than about 1000px. i would never make it bigger than 1000px for a website as you need to take smaller/bigger screen resolutions into consideration as well