Text behind mask attempts - Seyi

Yesterday  and today, I've been trying to do the text behind mask effect. My first attempt was rubbish, but with practice, I learned that in order to make it work, I should have not used the roto brush tool on the shadowy areas of the moving object. I used a music video with the simplest background.

I followed the tutorial below in order to make it: 

I used a little mix music video at first, but it came out really badly because I focused too much on the shadows, and the hair was too much of an intricate detail:



The next time I tried it, I used a music video which had much less intricate detail and nearly everything is smooth. It was not perfect, but it was a big improvement: