Assembling a semi realistic Jetstar Panel

I am assembling a semi realistic Jetstar panel from a basic freeware download used with Mike Stone's Jetstar. I have downloaded Jetstar cockpit photos from airliners.net and am using them to create bitmaps.
Flight Simulator and other chat
https://forums.simviation.com/phpBB3/
https://forums.simviation.com/phpBB3/viewtopic.php?f=16&t=37536
Does anyone know of a free paint program thats easier to use than MS Paint? For manipulating the bitmap backgrounds.