Minimize the ISO 

The ISO controls how sensitive your camera’s sensor is to light. Raising the ISO increases that sensitivity and makes low-light shooting a greater possibility.

The problem is that the higher the ISO setting, the more digital noise that appears in the photo. This results in a grainy look (as shown above). Though that noise might not be all that noticeable on your computer screen, it could be a glaring distraction in a printed photo.

Each camera has varying levels of ISO performance, so you’ll need to experiment with your camera’s ISO to determine the point at which things get too noisy. On entry-level cameras, that line might be ISO 800. On higher-end cameras, it might be ISO 3200

As noted above, having a tripod and a remote shutter release helps get sharper photos by minimizing the chances that camera shake occurs.

But they also help you keep the ISO low because you can select a slower shutter speed to brighten the image. Again, experiment with your camera settings until you find the slowest shutter speed you can use without inducing motion blur so you can keep that ISO low.