Back in Dudelange, he faced not just financial problems but negative criticism of his paintings from the Cercle artistique de Luxembourg.
His art was influenced by his reading Ruskin, Schopenhauer and Spengler, leading him into a Symbolist period where his work resembled that of the English Pre-Raphaelites who reacted against mechanisation by evoking the legends of the Middle Ages.
[3][4] After a few months in Paris (1905), Lang was admitted to the Munich Academy in March 1906 where he studied contemporary art and Impressionism (from 1907) which had a drastic effect on his painting style.
Unable to make a living from his paintings, for which he received little recognition during his lifetime, Lang had to remain a teacher for the rest of his working life.
Around this time, he began to venture out along the banks of the River Alzette painting scenes of orchards, flower picking, and fruit harvesting or of the peasant's houses in the area where he lived.