Colin,
Your order will appear on level II if it is a limit order but it will be
on one of the ECNs such as Island or Arca but only if it is the
highest bid or lowest ask on their books. You can set things up to
display the individual ECN books in which case you would see
your order at whatever price you have placed it at. ECNs do show
the actual size of orders at any price level, it is only MM that dont
always reveal their hand.
This is why Power View is of limited use and, in my view,
deceptive. You could see that the bid appears to have 20,000
shares on the bid and only 3000 on the ask so it would make
sense to think well the market must go up encouraging people to
buy. But then the MM that are showing very large size suddenly
pull their quotes and all of a sudden the 20,000 becomes 1000
Cheers
Paul