[Quickstep]

I don't think 3 coats of shellac would be near enough to fill the grain. I think filler is almost a must if you really want to polish to gloss. That said, I think the look you've achieved looks great. I think the look and feel of a couple of coats of shellac, leveled and then steel wooled then a coat of wax is great. For furniture I like it better that the polished gloss look.