3 sentences

1. 这幅画是仿的，不是真迹。

   zhè fú huà shì fǎng de, bù shì zhēn​jì.

   This painting is a replica, not an original.

   Source: Dong Chinese Dictionary

2. 这种字画是照着真迹模出来的。

   zhè zhǒng zì​huà shì zhào​zhe zhēn​jì mó chu​lai de.

   This calligraphy was traced from the original work.

   Source: Dong Chinese Dictionary

3. 他很有眼力，一眼就看出了这幅画是真迹。

   tā hěn yǒu yǎn​lì, yī yǎn jiù kàn​chū le zhè fú huà shì zhēn​jì.

   He has a keen eye and could tell at a glance that the painting was authentic.

   Source: Dong Chinese Dictionary