If you are in or around London between April 28 and May 11 this year (2016) you could do worse than visit the Cartoon Museum and have a look at their exhibition of Target book cover artwork. Full details: Doctor Who: The Target Book Artwork.
From their blurb:
An exhibition of original cover artwork to coincide with the reissue of these iconic books. Featuring over 30 pieces, including the covers from six of the new reissues, this is the first time that the artwork has been publicly exhibited. The exhibition will also include over ten covers by Chris Achilleos from The Daleks through to Revenge of the Cybermen, over 15 covers by Andrew Skilleter from Destiny of the Daleks through to The Mark of the Rani and other classic and well-loved original cover artwork such by Roy Knipe, Jeff Cummins, David McAlister and Tony Masero.
And if you can’t wait, pop over to Chris Achilleos’s website and see what he’s been up to.