I hate to be critical, but what we see here is the easy part. The hard part is getting the characters right. And we don't see any of that, here.
Those vague tiny featureless renders of Kirk, Spock, and some red shirt dwarfed by the Big Alien Things don't count.
Furthermore, the unrealistic proportions of the characters that we can discern don't impress me at all; quite the opposite, actually. I can only hope that the character drawings here are thumbnail placeholders in lieu of actual character drawings to be inserted once it's figured out exactly how to draw them (e.g., regard a faceless Spock).
Unfortunately, in Green Lantern, the character style is to render people with exaggerated proportions, and these sketches seem to suggest that the treatment might go in that direction, too. That sort of character style works in GL, but I have grave doubts about it working in Star Trek.
Consequently, I'm unimpressed, and actually concerned.
It's general concept art for an artists' personal enjoyment (albeit a professional one), relax.
Considering what it IS and not worrying about what it is not without the context of a series, I have to say the concept art is doing what TAS did not: utilize it's format to show just about anything without regard for the budget of live action. Limitations of the early 70s kept them from actually doing what they stated they wanted to do. Success.