They are oil paintings.
Watercolors
Learning to paint is something that even novices can do with the right instruction. Sites on the web like YouTube, Oxford Online, and blogs like Secrets of a Modern Painter are all good options.
Naturalism
If you ask about paintings ALWAYS name the artist!!! If it's the one by Norman Rockwell it is oil paint on canvas.
Vladimir Kush's surreal paintings' are very famous. The medium he used mostly too make his paintings was oil on canvas. He also has some paintings with gilcee on Canvas.
Oil Paintings
It is the most used medium for paintings.
They are oil paintings.
Juan Luna used oil on canvas as a medium for his paintings, including his famous work "Spoliarium." This medium allowed him to create detailed and realistic images with rich colors and textures.
Modern art paintings are typically purchased in a gallery that specializes in modern art. Fabuart and Arts2Art are two websites that allow online purchasing of modern canvases.
She made oil paintings and a few. pastels.
Watercolors
O'Keefe's paintings are considered "modern" because they were painted in the period known as the "modern age." The period that followed is called "Post-Modernist." It is less about style as it is about the time of its creation.
No, Holman Hunt did not use photography in his paintings.
Either medium is suitable. Some artists use watercolor for studies and composition, then create acrylic or oil paintings from the watercolors.
There are many places that one can find paintings of modern art for sale. Local art galleries will not often have sales, but there will occasionally be open house auctions for the interested buyer where one can find paintings of modern art for sale.