Another option to try is adding stamps using Stazon Ink.
Rubber stamping gives you many more options for your designs and can add a lot of detail to your piece.
After getting the ink on the stamp, apply directly to the desired surface. You can apply your stamp at any point during your process, meaning under the transfer, on top of the transfer and even on top of your resin. Do not rock the stamp or press down hard. Doing so will produce a thick blurred image. If you make a mistake, you can quickly rub it off. Or, if the ink has already begun to dry, use a stamp cleaning solution to wipe it off.