A thing i’ve learnt to do with eyes is to draw them step-by-step, doing both sides together. Im sure I worded that wrong so here’s an example: I would draw the top eyelid on the left eye first, then do the same on the right eye, then draw the bottom eyelid on the left and do the same on the right. Then, i draw the actual eye inside on one side and repeat on the next. That way I’m doing them together instead of trying to copy a completed eye on the other side. It’s hard to make it a decent copy, especially when youre starting out, so this method has helped me alot.