As long as images are photographs that you took yourself or the odd time have permission from someone else, merging them in a paint program is accepted.. It is when different applications such as 3D rendeing get mixed up in them we ask they be posted to Mixed Medium or 2D. Once in a blue moon we may ask a memeber to provide us with the original if it is know the image has been seen elsewhere... and like the statements says...use your own judgement. I viewed an original image very similar to this one you have and I think your version is much nicer.

"The happiness of a man in this life does not consist in the absence but in the mastery of his passions."