i am a beginning photographer. i have a canon rebel t3i. i have a 50 mm and also 70-200mm. i love to shoot pictures and i struggle of pictures of my kids inside... it is always just too dark. i only take pics of my kids, but i do want to step up my photography skills. this year I am focusing on getting better. do i take the plunge and buy a very expensive full frame camera .... or do i just try to perfect my skills. does the camera really matter?