The 24-year-old model from Houston, TX, was eliminated from the CW competition this week after falling into the bottom two with Alasia.
Speaking to Digital Spy, she said: "[Tyra] has a genuine personality about her. She is definitely a businesswoman, but I do see a softer side to her and she seems to genuinely care about the girls.
"I didn't get to spend too much time with her, but from how much I did, I was impressed. And she's very beautiful!"
Arens added that she is now back in Houston and planning to resume modelling and possibly "break into commercials".
America's Next Top Model continues next Wednesday at 8/7c on The CW.
> Click here to read our full interview with Brenda