Here's a trick that helps with natural light shots. Natural light is directional, even when you have a great light source, like bright indirect light coming in through a big window. You will still have one bright side, and one shadow side.
Try this: using an ordinary piece of white printer paper, angle the paper around and facing the shadowed side to bounce some of the light back into the shadows. It will brighten things up, is cheap and easy.
My paper here peeking out of the left side of the image, you can see that it is curved to reflect back into the contour of the teapot:
The original setup with no white paper "reflector" was very dark on the shadowed left side.
If I really wanted to get fancy, I could make little paper go-betweens to try and shield the light from making the little "hotspots" that you can see just to the left of the handle. I've seen people put little paper tabs on kebab skewers, and position them (like lincoln logs) until they cover the right spot. But this is fancier than I want to get for a quick shot.