You may use any kind of paper to fold this origami heart. I am using a paper with the same red color on both sides. Make sure the paper that you use is a square (all sides are equal and all the angles equal 90 degrees). The paper I am using here is 20cm x 20cm square one. It is a good size for those who are not experienced in paper folding. If you are become familiar with this model. Then you can try smaller size paper.
Step 1: square base
01.Let's start with "square base" . Prepare to apply two vertical valley-folds.
02.Apply two vertical valley-folds of the step #1.Prepare to unfold two valley-folds.