Valuation Request on some Steve Thomas Star Wars Prints

Hi Guys.

Dont really collect Star Wars Art but I have been offered the following Steve Thomas prints

First off are they legit? They all have a similar COA as shown.

Could you also advise me as to their value?

Thank you guys! Any help much appriecated

First up Sandcrawler







Dagobah





Beggars Cannon





Echo Skis