Hi this is my well. I struggled with the roof and lightning.
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Nice! 
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In the beginning Blender is overwhelming with options, switches and features. Be patient, most of them will be explained. Like lighting, modeling and texturing.
Because it is a outside scene, the lamp type could be a sun type. Which throws different shadow and lighting conditions. Now you are using a point light close by, which generates an uneven light intensity.
You can move the point light further away and in crease the intensity. Generates more even light.
Later the teacher will explain the world lighting (the gray background). This light type is also important for better lighting.
So much to learn, have fun. Show us your progress.