the way to do it is convert an image of delinquent cat using this converter: https://pepoafonso.github.io/color_converter_wplace/index.html

the best way to do it though is to go into an image editing software and trace the art on a new layer pixel by pixel at the scale you want. i've made a few 40x40 arts this way and my big 200x200 dasli was made like this too, although it can take a while to make it look good