First HDR Pic, needs improvement

This is my first manual setting image. I took a number of images using Shutter priority mode. Then i used layer and mask to combine the image taken at various shuter timing. The main purpose was to retain the color of the building which required higher shutter exposure, meaning more light and thus sun appeared bright. Then i had to take another image at a faster shutter speed which took less light, so the sun didnt appear bight and the clouds where visible. Finally these various images where combined using Gimp......The intention is to accurately represent the wide range of intensity levels found in real scenes ranging from direct sunlight to shadows. This is called HDRI and to learn the technique, check http://www.instructables.com/id/HDR-photos-with-the-GIMP/