Hé yóuhuà bùtóng, shuǐcǎihuà de yánsè shì tòumíng de, huàcuò le hěn nán xiūgǎi.
Unlike oil paint, watercolor is transparent, so mistakes are hard to fix.
Tips
grammar
In 画水彩画 "to paint a watercolor" the first 画 is the verb "to paint" and the second is part of the noun. The same doubling happens in 画油画 (to paint in oils) and 画国画 (to paint in the Chinese ink style).
