I love this style you have developed. The cut away of the spires is a nice touch too.

Is there any way you could make the airships 'pop'? Perhaps a slight change in contrast to the background? Or underside shading?

The oval windows jar for me also. I realize that the medieval style can have kind of wonky perspective. That is part of it's charm. However the windows diverge from the base of the wall, in the same way on all spires, (suggesting copy and paste) contradicting the prevailing style. imho.