In 1859, he opened a studio in the Tenth Street Studio Building in New York City, the artistic and publishing capital of the United States. Until 1863, he attended classes at the National Academy of Design, and studied briefly with Frédéric Rondel, who taught him the basics of painting. In only about a year of self-training, Homer was producing excellent oil work. His mother tried to raise family funds to send him to Europe for further study but instead Harper's sent Homer to the front lines of the American Civil War (1861–1865), where he sketched battle scenes and camp life, the quiet moments as well as the chaotic ones. His initial sketches were of the camp, commanders, and army of the famous Union officer, Major General George B. McClellan, at the banks of the Potomac River in October 1861.
The right paint stroke to use in interior painting is highly debatable. It's not a talent as much as a skill that is learned through practice. Many experts paint in a “W” pattern when using foam rollers, but others simply roll up and down then sideways with either brushes or rollers. The motion isn’t as important as making sure that the application is even and drip-free across the entire area. However, technique is important when you're covering over wall repairs.