1. Draw out the design you want on a piece of paper. Make sure before drawing that you fix the width of your drawing as per the size of the bottle you want to paint. We don’t want any pattern overlaps now!
2. Affix this paper inside the bottle using tape so that when you paint on the outside, the design doesn’t move.
3. Now paint directly or draw out outlines using a non-permanent marker.
4. Fill in all the details of your design, including a background.
Tip: If you want to add a background to your creation, then ensure you start the painting process with that. It’ll be easier to paint on the design details over the background color rather than make your background fit in with the lines of your design.
The second alternative if you are using a wide-mouth jar is to paint in the background color from the inside of the bottle.
5. Enjoy your creation! :)
P.S. - Remember the bottle-vases I painted a few months back? You can catch them in action here.