Examine your images at 100-200% magnification. That's when you see the problem. Baloons = underexposed & blurry. Also the color saturation and white balance is off.
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In addition to the blur and underexposure that Nancy pointed out, there is noticeable chromatic aberration in the first image, particularly along the tree line, but in other areas as well. I'm not sure what the intent was with the second image, but the little stick figure is unfocused. It's difficult to focus in a very dark scene, so it's best to use a flashlight or other light source to light it brightly enough to focus, then set focus and turn off the light before shooting, without refocusing. In the balloon image, the big blob of something intruding into the frame on the lower right really ruins the potential of this image, even if it were properly exposed and in focus.
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