Nousatsu Junkie

Naka is an aspiring young model with a problem: her face tenses up into a terrifying spectacle whenever she gets nervous on photo shoots! Naka's rival is Umi, the hottest model at their agency. But Naka soon discovers Umi's secret—and hilarity ensues behind the cameras!

(Source: TokyoPop)

Included one-shots:
Volume 6: Nozoite Mitakute Shikatanai (Peeping)
Volume 11: Kaeru ga Iku Taiwan na Hibi