Man I just have to ask you this man how can you make all of this in so little time? I mean I take so many hours with my art and its not even halve the quality of what you do man you are amazing!! Like always great job and love you’re imagination using a shell as a shield XD.
What I'm posting are art assets done for a game that was recently released. I'm just posting it with intervals (still some more coming). Though of course I was actually delivering the requirements fast as well.
What I can say is study, practice and bring it. You really need to give time (countless hours)to hone your skills (unless you are a genius, I sure am not). Learn from every piece you make.