The church tower on the third picture looks like Sankt Michaelis (Michel) in Hamburg. The tower was rebuilt into it’s current form after it burned down in 1906 so this dates the painting as being done later than 1906.
Source https://en.wikipedia.org/wiki/File:Hamburg-Michaeliskirche-Hafen.jpg
From the comments (thanks @emil):
The name of the artist seems to be "F. Müller". Müller (Miller) is a very common name in Germany, so you might need an art specialist to find out details. Franz Müller-Gossen might fit but seems to have a different signature and a slightly different style, it also could be somebody who hasn’t left traces in the Internet.
Credit:stackoverflow.com‘
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