I'm getting some new artwork for the covers of The Eden Paradox and Eden's Trial, using two paintings from John Harris, who was the artist for the last two books (Eden's Revenge and Eden's Endgame). While this happens the versions may go off-line for a short while on Amazon etc., but it should be worth the short wait... I simply love his artwork! 
I discovered him after reading several books by Jack McDevitt, one of my favourite American SF writers, as he sometimes uses JH images for his covers. So, stay tuned, new covers out soon...