usually problem with pic quality is between camera and floor or chair
first of all you have to carefully read manual for your camera, specially part about macro photography and minimal focusing distance, you have to know what's dept of field, how distance from the subject its affecting it, how different source of light its affecting your pictures, then you have to understand difference between shooting somewhere outside and in fish tank, its lot so stuff what you have think about it before you push the button. It's more ways how you can accomplish success in photography, you can go way "trial and error" or you can join local photography club and learn from somebody there or also you can buy book
