They do look retro, but who doesn't love anything retro..... i think unfortunately this falls under the catch 22 situation where you will never please everyone, i like retro so very appealing to me whereas someone who doesn't like retro will just turn there face away.
there is allot of detail in some of the illustrations you have used which is always a good point, to me an author that puts allot into the cover also does with their writing.
i think maybe some proactive advertising may help you. there are allot of american users on this site, maybe post up a paragraph of your work on here for people to read and gain there op-pinons... its worth a shot maybe..
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