Sky - 10 shots stacked with Sequator for noise reduction and pop-up os stars as the location is quite light contaminated.
Foreground - Single shot
Sky and foreground blended with Photoshop

This image shows the most beautiful Winter constellation rising behind the main tower of medieval Palmela castel -Portugal , South of Lisbon , followed by the trusty Great Dog constellation where lies the star Sirius, the brightest star in the Winter sky.
In the bellow right corner we can also see the lights of several cargo ships in Setúbal bay.