Want to create collar and other smaller pieces of leather work in the style shown in the picture. It appears to be a bright coloured suede/leather sewn between two pieces of black leather, where shapes are cut out of the front piece.

I’m having difficulty cutting clean/neat shapes out of the front black piece. I’ve tried to use a sharp craft knife, but it wasn’t clean and curves were difficult. I also tried using punches, but struggled to find any of a good size and in curved shapes.

Any idea or advice? Thanks in advanced.