Would need to see how it looks from inside the glass, not the side. The pic you posted earlier (even though it was a milky coffee), showing that lovely thick, 'yellowy brown' crema around the sides of the cup, is how I like it to look.
Like this:
http://imagizer.imageshack.us/v2/xq90/922/IeiJIe.jpg
If I'm not drinking through that crema, when having an espresso (or cappuccino), and it sticking to the sides of the cup making rings around the sides, as it's being drunk, like the head on pint of beer does on the accompanying glass, then I won't really enjoy it.
And the denser and thicker, more yellowy brown the crema, the better! :)
Marco.