Wow, awesome work man! And very nice speed too,... considering there's a gap of 28 hours only between this and the first B&W submission (and I guess you had to sleep, eat and all the stuff that's necessary to stay alive and healthy), I'd say you've been pretty fast.
I agree the pics may remind a bit of Feng Zhu, but I'm with Hawthornearts in that it's not an issue; concept art is about being able to generate ideas and comunicate them in a way everybody may understand, something I believe you've proven to be really good at... also, I agree with you: there's no better way to improve than watching the masters and learning from them...
Uhm okay, so in the first one i think that the moon(s) is too much and it would look better without it.
For the second and third one i would say that there are too many "eye-catchers", your eye just doesnt know where to look(though its really well drawn), in the second for example there are just so many details in red.
And a hint overall, try to find your focal point! Its really important.The third has a really good focal point, and with the guy in the front its even better