I think sepia takes away from the play of light that is SOOOO important. B&W is better, but you can tell if it's a program or film. What type of camera are you using? Do you print them, or are they just digi right now? Print makes a huge difference, too. You can critique yourself better (I think) if you have your pics on paper. They're beautiful pics, you should be very proud. I love digital, but I live by the 5% rule, I take a lot of shots because only 5% seem really great to me. The more you take, the better they get. Keep shooting!
I totally understand about the instant gratification thing... I tried scrapping, and my attention span is just too short. But cards are quick and fun and useful. And yours are beautiful! And so varied!