I need to train more

Hello people of Steamgifts.

I have tried taking a pretty picture with my new camera but it came out really weird. I think I need to train more with it.

The picture seems overexposed in some parts while quite underexposed in others. The lens seems clean, yet there are dark spots all over the image.

Can anyone have a look at this picture and help me figure out what's happening? It's really puzzling to me...

View attached image.