Unfortunately, it will be very difficult for us to trace the images or even enlarge the image to print because the outcome of the image on transfer media will be very rough and pixelized.
Please see the picture below as an example. This is the image outcome when it is enlarged.

If you only want to print just words on the t-shirt, the best option is to provide us the exact fonts so that we can cut and press using flex transfer. This way, the outcome of the printing will be good.