It looks OK. One thing you could perhaps do is maybe tidy up those font panel I/O connectors (the cables hanging about underneath your graphics card). See if you can somehow route the cables so they go from the front of the case, behind the board, and then to a cable management hole underneath or nearby to where they need to be plugged into the motherboard. If you can do that, that should clear your look up a lot.
Rather than putting that thin wire through the top of the cable management holes at the top of the case, see if you can just tuck it behind the motherboard. The same for the wire in the top left corner (presumably a fan wire?), just tuck it behind the board a bit.
I'm thinking of writing a tech guide about cable management in the near future. I've already written one tech guide for this forum.