T-Shirt Designer

Hi, I am looking for a graphic designer to create T-Shirts designs (PNG; 4500 x 5400 pixels; 300ppi; CMYK, less than 25MB; transparent background). I also want the PSD. file.
The designer is responsible for researching profitable niches and creating the designs.
I like more graphical designs.
Show me your previous work and write price per design.