Canvas, mainly depends on how you plan to make this poster, what size, because if it is used as a welcome poster, the size is generally relatively large, such as the X frame or painting axis provided by the photo studio. Generally around 180*80. If it is a canvas, this size may be too large. If it's just a small welcome sign on an easel, the canvas is completely fine. Another question is, do you want to use oil paintings when you use them? Or is it just the effect of making oil paintings with computers? If it is the second type, you don't need canvas at all, just normal ink painting.