Woh! That is awesome. Is it for real? Well, looks like you're really getting that night photography down. You really captured that star filled sky.
That photo is 100% real. In fact there is almost no Photoshop manipulation with the colours I don't think. The reason the tank looks non real I think is because at a 30 second exposure 2 cars drove past during that time, creating different shadows (I planned the photo when cars were going past to light the tank up).
It's getting better. Problem is I think that yellow on the horizon is a major city 150km from me, so I think I really have to travel some distance in order to get better stars