I have created a module for cinepaint. It'll go through testing next and we'll make sure it works before it goes into the software manager. Thanks for putting in the request.
In the future it would be a great help if you could provide a couple of links along with any PBI requests. A link to the project's website and another link to the software's port page if it has one. For example: http://www.freshports.org/graphics/cinepaint/