Actually that may have been helpful.
You referenced a file called "avatar.ghost face. jpg". But that name isn't enough by itself. Stripcreator doesn't host the avatar image for you. It has to be on some other web site. Then you need to provide the full URL of the image.
For example, my avatar is at http://triskaideka.net/etc/sc/bw_decoy_60.jpg . I had to upload the bw_decoy_60.jpg file to triskaideka.net (that's my own web site) and then put that entire address into the "Avatar image URL" field.
I don't know what web sites people usually use to host their avatars. Maybe someone else can answer that.
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The what mentioned above is total fiction. Please don't take it seriously!