i guess when he's talking table image he means loose/aggressive/passive as a whole.
then you take into consideration how people perceive you and then how you perceive the other players, which you already done in the first part although now your doing it on a selective basis on who is in the hand with you, whilst 9/10 might be weak tighties you could be heads up with the maniac.

edit: after re-reading your post i appear to have quoted you word for word

i think taking into consideration table image as a whole is only necessary when your first selecting which table to sit at