If I wanted to make a ghost like animal, I would use the the smudge plugin and blur tools to slowly fade it away, not to mention opacity as everyone else.
Gonna put up my soon to be sig. 100% PDN except for the text which i used an online logo generator. The text is extremely edited though.
Edit: Re submitted cause of the size.
Ive been using paint dot net for some time now and decided to join the community! The spoiler below is for my abstracts.
Bird in the cold
Cheetah
*Hot*
Lambo
Fire breathing Lion