so long as you leave the images where they are the links should remain valid. If you move from /blog to the main directory just leave the sketches folder where it is and it won't interfere with wordress.
Leave the original bog in place till you are happy with everything.
I would also suggest making sure the link structure is the same in both and you should be able to set up a redirect from the old directory to the new site using htaccess
The problem would be if you were moving to another domain and for some reason closing down thousandsketches.com
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