Odin_aa said:
It is not a camera with a changable lens system, this is a digital still camera (DSC) and not an SLR (Single Lens Reflux). There is not the opportunity to buy a lens for a specific application, but lens filters to give effects such as fisheye etc.
Single Lens
Reflex you mean
Bloogrape, some of your shots look a little overexposed. Since most of those shots were on ISO100, you could use a faster shutter speed or close down the aperture (increase f-stop number) Be aware that f-stop also affects depth of field - something very important for macro shots. The larger the f-stop number, the greater the depth of field.
If you're shooting in low light, increase the ISO if you're shooting hand-held, or as you said, use a tripod. Greater ISO allows for faster shutter speeds (and less camera shake), but at the cost of more grain/noise. Generally, shots of 1/60 shutter speed and faster don't have camera shake if you're steady. Slower than 1/30 and you should look at using a tripod where possible or something else to rest the camera on.
Best of luck with your new camera