Without seeing examples, it sounds like the shutter speed may be a little slow (low light, indoors). You might want to try Av mode and try increasing ISO to maybe 600 or so. Noise should not be much of a problem. Primes are good and large apatures let in a lot of light, but they also give you shallow depth of field to blur backgrounds (great effect!). You might look into a 16-35 f2.8L for indoor zoom.