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Yes, that would at least help. I'd drop by the art store and get a spray can of retouch varnish, though, so you can quickly hit the entire painting, which in turn is going to help make the values assessment more accurate.
I have one of those aspirators you mentioned but I've never actually used it. (Just seemed like a good idea, or neat gadget, at the time, I guess.)
The "thick-or-thin paint" caution doesn't apply to retouch (as opposed to final) varnish. Retouch is a diluted varnish that isn't going to form the hard, "crackable" film of the final. It's ideal for bringing up pigments that have sunken in. (Some folks also use it as a compromise "final" if the painting has to be delivered before the paint has dried sufficiently to take straight varnish.)
By the way, in cleaning up this thread earlier, I think I inadvertently deleted the photo image that you had in fact intended to post. Oops. You might wish to re-post that.
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