draw the skeleton outline of the picture you intend to use - then save this picture before adding more information to your picture -
As this is called 'tree lights' the next step is to decide where the tree lights are to be placed.
After placing where the wire of the lights should go - the lights may then be added.
Finally, all of the bitmap pictures that you want to use need to be saved in Gif format and dragged onto a Gif maker. Three pictures have been used in the above simple picture of tree lights flashing.