ISO, Shutter speed, and Aperture experiements

With each pic, I'll post the details (or whatever they are called)

Focal Length - 40.0 mm
Exposure time - 0.017s (1/60)
Aperture - f/4.5
ISO - 1600

I can totally see how ISO makes the pictures more grainy. Here's I pic I had with a lower ISO in the same room:

Focal Length - 37.5mm
Exposure time - 0.100s (1/10)
Aperture - f/4.5
ISO - 800

This picture looks too bright to me. Maybe a faster shutter speed? Less aperture? Am I understanding this correctly?

Here's a couple others:

Focal length - 40.0mm
Exposure time - 0.033 (1/30)
Aperture - f/5.6
ISO - 1600

Focal length - 32.5mm
Exposure time - 0.033s (1/30)
Aperture - f/5.6
ISO - 1600

Ok, what do you think? And Emmi, I know you are reading this. For the love of Pete, comment and give me help!!!!!!!! You need to come home soon! Perhaps this weekend we can head to the conservatory, maybe? Maybe I can just call you instead of addressing you via blog? Maybe it's too late and I should set down the computer and go to bed?