I use 6"*6" tiles with under glaze colour with a clear glaze on top. Some of following murals where made for commissions. As each are a painting and if in the firing or making, there is a fault of any type, you have to make a new one. So they are expensive to make.
Balmoral Hotel at waverley station in Edinburgh his panel is 24" by 24"
Cockeral hen and chicks 24" by 24"
24 " by 24"