As far as I can see, this is one heck of an awesome deviation!
Sonic and Tails both deliver dynamic poses as they head to the unseen horizon. They look true to their original designs while keeping the old Sonic flair. The color job is superb and brings out the characters in a beautifully thought out background. The New Mobotropilis-esque building background as a nice Archie Sonic touch and the street below Sonic is passable.
On note, this deviation seems to be inspired by the cover of Sonic the Hedgehog #66 with the same duo and poses. A fine job indeed from JetstreamX!