You could give advices only when you are sure, it's ok. But in other cases you also can share your opinion (just say that it's not advice, just your point of view). If you are wrong, someone (maybe author) will correct you. It will be very useful for you. For learning english try "Basu". Very interesting app with different exercises. Also "Tandem" is cool app for talking/chatting with native speakers. I use both

Hi Yuri! I find the 2nd nice, but the 1st one is missing some perspective as Serena said. If I'm not mistaken, Proko said that on these stages you have limited amount of instruments so sometimes you should use exaggeration. (I hope I understand this term correctly) Even if you look on the model exactly from the profile you''ll see back bulge.

=D