painting

I try to find out in artprice.com and I think it depends of the size and type of artwork (oil, watercolor).
This is a copy and paste of what I find out:

Wilhelm Egon WIEDEMANN (1905-1969)

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Auction records [ 6 ]

Page(s) - [1] Currency : EUR USD GBP Sizes: in cm Sort out by : SALES DATE
Hammer price
Title
Size
Medium
Date of creation

Interieur mit Figuren
Painting, Oil/masonite (19 5/8x23 5/8 in)

Not sold
Estimate CHF 500 Dobiaschofsky Auktionen AG , Bern BE
SWITZERLAND , 20 May 2006

Full details / Auction catalogue
Palmenlandschaft im Abendrot
Painting, Acrylic/canvas/board (23 7/8x31 3/4 in)

Not sold
Estimate CHF 600 Dobiaschofsky Auktionen AG , Bern BE
SWITZERLAND , 20 May 2006

Full details / Auction catalogue
Die drei Grazien (1949)
Painting, Oil/canvas/panel (39x26 3/4 in)

EUR 585
Estimate CHF 800 Dobiaschofsky Auktionen AG , Bern BE
KUNST
SWITZERLAND , 12 Nov 2005

Full details / Auction catalogue
Mädchen im Tropenwald (1946)
Drawing-Watercolour, Watercolour/paper (22x29 7/8 in)

EUR 330
Estimate EUR 300 - 400 Neumeister , Munich
NEUMEISTRERS MODERNE
GERMANY , 10 Nov 2005
PERSONAL RESEARCH report available

Full details / Auction catalogue
Junges Mädchen mit Kind (1947)
Drawing-Watercolour, Watercolour/paper (27 1/6x19 1/4 in)

EUR 330
Estimate EUR 300 - 400 Neumeister , Munich
NEUMEISTRERS MODERNE
GERMANY , 10 Nov 2005
PERSONAL RESEARCH report available

Full details / Auction catalogue
Tanzendes Kubanerpärchen (1939)
Drawing-Watercolour, Watercolour/paper (21 1/4x16 1/2 in)

EUR 200
Estimate EUR 150 Hugo Ruef , Munich
ALTE UND MODERNE KUNST
GERMANY , 08 Dec 2004

Full details / Auction catalogue