In general you can just take more strings that you knot around to make it thicker. More strings also give the option to make flowers in different colours. But for that you wouldn't really need an extra pattern.
@cthulhuwiz you hide the unused white strings in the green knots. So instead of just making the green knots around the yellow strings, you make them around the white and yellow strings at once.
There are plenty of videos and even one tutorial explaining how to do it, so I recommend checking out one of those.
Love this pattern 😍 . At first I was sceptical that I would be able to complete however it was surprisingly easy to follow (although I used the wrong colours) 😍 🔥