Here is a collection of all of Dolly's "original" album covers and a few compilations at the bottom! I think these little works of art tell a lot about how her career evolved. (Sorry they're so small; but there are so many that large pics would take up too much room!)
And a few of her many compilation and repackaged releases:
The final shot is the cover of the CD re-issue of 1975's Best of Dolly Parton. The photo used for the re-issue cover is one which was on the interior album cover of the original lp.