It looks like you are starting to get some effective assistance, Sara! The blue colouring and the noise in the sky are, in part, by-products of the long exposure. Both can be addressed in post processing with colour balance and de-noise software. The overall exposure looks to be very close to me as the image conveys an early morning or early evening look, which is partly the result of the blue in the white balance.
If you need assistance in colour balance and noise removal, we will need to know what post processing software you have available and how comfortable you are with using it to accomplish these goals.
Much of what I see in this image is perfectly acceptable if you are trying to create that early morning/evening feeling. In addition, is is a pleasing composition with relatively good technical aspects for that kind of an image.
As your goal is to learn more about long exposures and metering, this might be a good time to go back and experiment with different metering approaches (but not change anything else for that series of experiments). For the second learning experiment, try shooting different time length exposures and again, make sure you keep the exposure values stable.
Be sure to keep good notes so that when you evaluate the images, you can carefully compare the results of the different settings used. See how the changes affect the look of the image and what results you prefer. You can then shoot one more time using your preferred settings and you will likely be very close to what you are aiming for. If you still have question, post the results along with the notes and we can help you get closer to your goals. If you don't have any more questions about this image, please post the results so that we can all share in your success!