Wow... those are fantastic. You surely make the best art out of anyone on Queenzone. The only thing wrong is that you're sometimes using pictures from the wrong time period. Keep in mind how long their hair was on each tour. :)
For instance, if you could make the front of Cleveland with the ADATR album cover, and use the same (or a similar) picture of Freddie for the back as you used for Bristol, then it would be perfect.
I've gone off HCV's work, to be honest.
While very professional looking, I prefer my artwork to be relevant to the date in question.
For example, some of the ones at queenhouse.de use ticket scans, poster artwork, etc to create really good covers.