I had been eruop many times and saw many famous paintings in the museums.
All the painting quides would mention about the "light , shadow..." as how great the artists could do. However, i never really feel the greatest itselt.
Recently i saw some painting on others' blog, and I realize how beautiful and how difficult it is.
Since i have done lots of photo edit for the best presentation, I know how difficult it is.
Just look those painting photo, they are painting realistically.