im an aspiring photographer, i bought my first camera, canon SD600, to take photos of my trip to europe after graduation. I fell in love with photography, and my friend convinced me to make the leap to dSLR. So now im working with a canon rebel XTi, and loving it. Since im quite an amateur at this, any and all feedback, be it extremely negative, constructive critisim, or admiration is very welcomed. any advice you could give would be most appreciated.