I think it's 4 variations of one picture. If artist would want to express passage of time, he would probably make some changes in overall disposition, not just brightness and Reimu.
By the way this picture goes with the story that could be found in english in yu113.doc and later versions of it. Story goes by number 170
>If artist would want to express passage of time I'm guessing he did, and that this is either just an edit of the original picture by someone else, or a lazily done remake.
Nope, I mean't 4 panels of picture is 4 variations of same, not the passing time. For example, look at Marisa's burns. In second panel they seem a lot lighter then in first, and in next panels they are severe yet again. This can't be if panels are just time passing, not variations of one.
By the way, maybe we should start collecting yukkuri stories at the wiki? Collecting them here will be more convinient tnen collecting them in .doc and less will be lost.