Quite often we receive images that are too small to work from. As we redraw images manually we need to be able to see it to be able to redraw it into vector.
In this example the artwork was too small to be able to see the details clearly. We could have drawn a simplified version excluding all the tiny details, or try and guess some of the details using our own judgement, which is not ideal.
But fortunately, in this case we were able to find a higher resolution version online which showed up all of the details clearly.