Head in a Jar Practical Prop

To make this prop, all I did was get a large jar that was filled with mince. The mince was not important, and was scraped into the food bin as soon as I got home. Once the jar was washed out thoroughly to clean it from the mince and juices, it was clean and see through, and I then typed in Google "Head in a jar picture" which after searching came up with the picture below, and I printed it off, 150% the size of A4 and rolled it inside of the jar to make the illusion of it being a 3D head. It looks better from distance, in dark light and different angles, and the reason for this is because the insides of the jar are narrower as it goes down, and its shape inside is different as it goes down, not letting the paper expand all the way and roll around without parts being missing from the inside.