The bas relief has a crack on drying that needs fixingDegrade some toilet tissue by soaking in water. Other tissue will not degrade as well and will become lumpy
Use Paul's Hamburger method - 2 clay patties and 1 tissue ball
Mix until the paper fibres are indistinguishable from the clay
And here is paper clay. It is very versatile and strong. It should generally be dried out on a plaster slab though before working as it's very sticky
Although for a quick fix like this I just dampened the crack and worked the paper clay in
