Seriously, nowadays people upload so many ways of drawing a specific object, person, places on youtube... I'm not saying it is bad to learn from them, but ...will you imitate their style if you try to draw the same way they do? Will you loose your own "way of drawing"(the one you grew up with?) I guess this methods of improving by copying means there's not gonna be many creators in the future, but on the other hand, you may acquire techniques and use them to learn new methods, and thats what imitation wants you to know, to learn the tools and start from there to do your own creations. The key is being original, and I guess it's kind of hypocrite of me to say it (because I draw some RE characters) but at least I'm not drawing from an existing model, pose, style, right? It's cartoonish, thats the style I grew up with, it may not be manga but I certainly feel proud of it, I think you must be proud of your own creations, too.