Just testing out this twenty twelve theme - I notice there is a limit on the size of in-line images that this theme supports but I guess there is a reason for this as posting huge in-line images can present problems for people with smaller screens & mobile devices and it can slow down the speed at which pages load. The good thing with Wordpress is that you can link the inline image directly to the full size image, so the full size can be viewed easily with a singe click. I have decided that I'm not so keen on the "toolbox" theme as it does not work when I view the site on my iphone - the text looks kind of messed up, but the twenty twelve theme seems to work fine in both safari mobile and mercury browser (my favourite browser for iphone)