This was my 3rd attempt.
Attempt 1 - I was on round 4 when I realised I had missed a "Change colour"
Attempt 2- This was turning out very flat and I realised I was not going into the right stitch between the petals.
Attempt 3 (above) is much better, however I think the petals need to be completed with some double treble to give them a bit more depth.. (I had to arrange the petals a bit by hand so it would display properly.)
It's not too difficult. Once you get the idea, you could keep on adding more rounds of petals.
I will have one more try and then type up the pattern.