Oooh... I get you... One of the benefits of paid account status is not having to have any part of your journal look like the regular LJ layout... if you want your user icons to appear on your posts behind the LJ cut you might wish to consider using a different layout...?

There is also an option to "Show user picture icons with each of your entries?" which may be set to No in your case under the Edit Customizations page. Hope that helped :)