I like the unedited version. Why alter the moon? An altered moon against original everything else is distracting. An altered moon would look fine if the rest of the picture was sharpened or saturated.

For free, online image editing, try Aviary.

In college, a friend doctored a house party picture before posting it online. He thought he edit was a solid black spot, but at full brightness, it looked like crayon scribble masking the music department audio mixer we'd "borrowed". It helps to check.