https://playground.babylonjs.com/#YDO1F#454 here you go. I have added a line at the end to always look at camera.Turn this off and you will have your solution. You can add your png to this plane texture and see how it works for you.
Also, if you want your image to have both sides then set mat.backFaceCulling = false; otherwise just set it to true for one side culling.
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