The door decorated for Valentine's Day was part of a project designed and taught by former Miamian Donna Parker.
She taught classes called "A Door For All Seasons". The basic door box was the same, but there were five sets of decorations, Valentine's Day, Easter, Fourth of July, Halloween, and Christmas. Of course clever miniaturists were free to make more decorations for any desired holiday.
Donna later put the instructions on video and sold them to miniature shops in various parts of the country so you may have seen this particular project.
I made a dozen of these doorboxes as they were very popular with family members and friends. The first picture is a variation on the normal box as the friend for whom it was made had a modified wrap around porch and the doorbox reflected that.