The blurriness can be attributed to your camera focal length.  A smaller focal of length of 28-35mm will sharpen the dome image because it is taking more viewing area under consideration.  But this is at a sacrifice of rendering your figure under a wide angle setting; not very flattering if you are attempting to render closups.  However, once you try to render with short to medium telephoto lenses, you narrow your viewing range and magnify the background.  Subsequently, the image degrades and becomes blurry.