Most often I know all too well when the light is wrong, and that I should not be taking pictures. This happens after just completing a piece, and being so excited (yes, still, after all these years!) I go ahead and take pictures. I know the best light to show off my work~ late afternoon as the sun sets, or a little earlier on an overcast day. Too early, and everything is too bright. A little late, and everything is too dark. So there is a fairly narrow window of opportunity for the best pictures. But in my enthusiasm for a new work, I sometimes can't resist.
Often I end up going back and retaking pictures. Sometimes I am horrified by how poor the first pictures were~ no big surprise that the wonderful new piece didn't immediately sell!
After dropping my beloved old Olympus D-250 three times, it finally broke two years ago. After trying out several cameras, I chose a Panasonic Lumix DMC-LZ2, and love it. The macro function is fantastic, and it has this steady shot business which helps to compensate for a wobbly hand. Often I hold a big light in one hand, so taking dozens of pictures with one hand, this anti-shake function saves the day.
Yep, pictures eat time. But they sure are important.