Can you work to a specific size other than the ones listed? What is the largest possible size?
It's possible that you already own a frame that you would like the portrait in. In this instance I can cut the paper to any dimension that you request. In terms of price, I charge to the nearest standard size. For example, if you wanted the portrait to be 15" by 13", then this would fall in the 16" by 12" category.
Occasionally as I am working on a portrait I may decide that the work needs to change in dimensions to accommodate a feature or improve the composition. If this is the case I'll let you know this is happening to check you're OK with this.
The largest possible size for a portrait is 29.5" by 21.5". This can be ordered on request for large scale group portraits. Please contact me to ask for a quotation for this.