Hey Welcome to the site man, also youre english is'nt that bad(i've seen much worse from people who actually do speak it as theyre main language XD.)
About the studying without creating thing, it's defineitly true to some extent, I went through a long period where I pretty much did nothing but study's and I did improve but I sorta burned myself out on art from it for a while plus now that i'm actually trying to draw from imagination again, 'm finding it hard to think up ideas to draw(albiet I think i'm getting much better at that again.)
However the opposite is obviously true as well, you're ideas would grow alot but you're drawing skills would probbly stagnate(I've seen this in my friend's work as he does'nt do studys for whatever reason).
Quite frankly I think when it comes to studying vs imagination there's no one size fits all, some seem to learn more quickly from doing quick studys and lots of imagination drawing and some the opposite(I think i'm the latter). Just need to make sure you don't go to either extremes I think.
Anyway, as for crits so far I think you need to learn more how to draw structure, so far youre ideas are cool but they look pretty flat. For that look into hampton for anatomy, I think he does a much better job then Loomis at explaining how to draw the figure in 3d and he explains how to build up the figure and parts of it from a gesture(plus he explains a very good way to do gesture drawing.
Also I would reccomend watching the form vids on ctrl paint, and drawing some objects around it
http://ctrlpaint.com/videos/simplifying-form .
Doing some gesture drawings would also help unstiffen your poses alot as well I think, I always use this site, has the biggest variety of poses and most of them are great quality
http://www.quickposes.com/
Anyway good start and keep it up man :D.