The style matches several paintings by Benedicte Brummer of Denmark and dating 1881-1974.
When assessing an artist's work, appraisers must look at completed sales of works by the same artist. Art gallery sales prices are private.
We must then go to auction sales prices which are public. When using comparable work by the same artist, medium, subject matter and size are factors to be considered.
Appraisers most often use price per square inch of previously sold comparable works by the same artist as a measure of value.
My research indicates that your Brummer painting would have an estimated retail value of $400-500 assuming good condition and depending on sale geographic location.
As for retail value, I have seen art sell for 4 to 5 times auction values depending on the tastes of the art gallery owner as well as location of the gallery.
In general, a private seller to a dealer, via consignment or at auction can expect 30-60% of estimated retail value.
Insurance replacement values are usually about 10% more than retail values.
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