Quite simply the materials used to paint the picture. Pigments used for painting may be, among other things, water or oil based.
Generally, but not always, oil based paintings endure longer.
painting of oil is called oil paint and painting of vinyl is called vinyl paint
how can I tell the difference between acrylic and oil paint on my wall?
Oil paint, watercolor, pastels.
No, oil paints will always dry slower than water based paints.
Oil paint, watercolor, sculpture, paper cuttings, ...
watercolor is a type of paint. oil, acrylic and water color are three different types of paint.
It makes a difference if you are putting it on a deck, as you suggest. Oil paint may not survive more than a year on an outdooor deck.
oil paint
Georgia O'keefe mainly used oil paints on canvas for her artwork.
well old people are likely to get it (no offence to the old people though)
mostly oil paint, but in his later years also a lot of beautiful watercolors, painting the landscape.
Traditionally portraits are painted in oil on canvas. Nowadays artists have greater freedom of choice: watercolor, acrylic, etc.