The building itself looks quite good, that is, it's painted well. But since this is a building from a kit, you should have taken the opportunity to build some rubble and such at the base. It looks very clean for a ruin of this size. Some close up shots of the detail would be nice too.
This is very nice. I just bought the Imperial Sector box set and was having trouble deciding what to build with all of those parts. This has given me some inspiration. Great job ! How big is the base it's on?