The artist of those is Scott Sherman. His page, www.scottshermandesign.com, has full info on his work. He has worked with both Universal and Disney, and helped plan several attractions.
As for the Jeep Tour - it used to be listed on his web page, which is where these images came from. A couple years back when I discovered those images his site made it clear that he had designed that ride while also working on other Jurassic Park attractions, such as The triceratops encounter.
A year or so ago, all traces of the images and that project were removed from his site. Has the attraction come alive once again? Did Universal just dislike him showing off something they never built? Who knows.
Mike