Earnings season is well upon us, with three big players in the insurance field -- AIG (AIG -0.11%), Allstate (ALL 1.58%), and Markel (MKL 1.57%) -- set to announce earnings in the next few days. With some trends already spotted in the earnings of Progressive (PGR 1.02%) and Traveler's Companies (TRV 0.40%) earlier this month, Motley Fool contributor Jessica Alling has a few key items for investors to look out for. In the video below, she details the key items, what we've seen so far, and how investors should evaluate moves by the companies.