As you could have figured from the title, this is about my eyebrows. I don't necessarily have an issue with my eyebrows: I love their shape and luckily I still have a good amount of hair to work with. HOWEVER, I have always loved thick, bushy eyebrows. My high school boyfriend had these big bushy brows that I just adored. I would always tell him how much I envied him for them. But that's besides the point! My best examples of how I would love to have mine be like are Cara Delevingne and Lily Collins. I guess my question(s?) is (are): Is it possible to grow them out like that? I have used (and occasionally still use) castor oil and vitamin E oil on my lashes and brows. Also the rapid brow enhancing serum. Both have worked in making my brow hairs thicker, but I haven't noticed any sizable growth? Most hairs grow around my brows which the lady who threads them always takes off. She leaves them as thick as she can, but what you see in the picture attached is about it. What can I do? 

P.S 

I understand that Lily and Cara likely have their eyebrows enhanced with make-up, but they still generally have big brows.