I have some beautiful18th and early 19th century oil on canvas paintings but am struggling with Artists and possible values. The first is signed A. Modigen with 2dots over the O making it difficult to search for information. This painting was my Grandmothers and was in Berlin through WW2. Thanks for any help!

Good evening. Could you upload a picture of the painting? Thanks

That is a German name. The 2 dots over the vowel is an umlaut.