First one seems to be just a little tilted. Though I think this might not be really the case, and might be just an impression given the fact the hill is growing from left to right. The reflections are nice.
I also like the composition of the second one. Just maybe a tighter crop to take some of the non-interesting sky off. And maybe making the star trail a bit more highlighted.
Third one is not really that interesting to me, but it might be an interesting spot for that city, and so it might become an interesting pic.But I think an adjustment in white balance and colors to make it less yellow would benefit. And maybe a tighter crop also, cause since its too dark around it to contextualize it, the surroundings become irrelevant and uninteresting.
Just my views. Congrats!