MS Paint Anyone! Fire Apparatus Part III

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Question for anyone, I have done a few drawings of a RM and MM tower ladder but they keep coming up too large (MB instead of KB) to upload. I've tried both upload versions and still no luck. The drawing that I used for the base vehicle shows 44.3 kb as it size. Both drawings are similar as far as details, colors, etc. I didn't think I made such significant changes to effect the size. What do I have to do to change the size. Its cropped correctly, I've done Ladders before without a problem, I just don't see why these two are not working. I notice some drawings appear "blurry" when viewing them, is there resizing done or a change to the format before uploading?