This is what one should expect when working as a professional artist. Here is a goal for time management. Check out Atomhawk Design process for more details in regards to what you need to practice in order to create this caliber of work with these deadlines.
I am going to start tagging things on here called ITD which stands for Inspiration To Draw. I sometimes find things on "the internet" that inspire me. Usually this is because the creators put their heart and sole into it and I think a little bit of it spills over. Enjoy Hawken from Adhesive Games
Trevor is an amazing artist that works at CCP as a Senior concept artist he also has a live stream above where one can learn about the games industry. He is more then willing to answer questions about technique and about what to expect when working as a professional artist.
Anthony Jones points out how there really is no secret to becoming great at art. I think all of us know this, but at times we still search for this holy grail.
Anthony Jones is an amazing teacher. Check out his links