Today on a whim (and a past suggestion of a client) I took a mini road trip down to Wheaton Villiage. I decided to leave my polarizer and flash in the car. The flash I wish I had brought with me to bounce off of some walls. In all fairness, I didn't know what to expect, but I wasn't expecting any indoor time with the camera and my uncooperative fidgety model.
I dealt with the harsh 2pm winter sun and low indoor lighting with only allowing my ISO to hit a max of 400, even though my camera can go to ISO 3400 with very little noise. The indoor images look good, but I think they could have been amazing if I had my speedlite to bounce. My lesson learned from today was to assure I always have my speedlite with me. I could have captured a few more great images, had I anticipated all the indoor time the afternoon was going to bring.