John Nadeau did a lot of pencil and cover artwork for Dark Horse Comics Star Wars comics in the 90s. This is a copy of the painted cover for Star Was: X-Wing Rogue Squadron #22 without all the text getting in the way of the gorgeous visuals.
That particular issue was released back in September of 1997 and was the second part of a four part story called In The Empire's Service.
On the world of Brentaal, Imperial General Isoto prepares for a Rebel assault. His goal: not to save the planet, or even the Imperial base, but to save himself. Isoto has the best shield there is, the Empire's greatest fighter ace, Baron Fel. But having the Baron and having him take orders are two totally different things!
The story is collected in graphic novel form as Star Wars: X-Wing Rogue Squadron Vol 6 In The Empire's Service for those who are interested.