There are numerous sunflower tutorial both out there online and here on our blog. Vast amount of video guidelines and charts are available all across the board, however I will argue that this particular sunflower design maybe the best you can find.
The great thing about this design is that in fact it is a double tutorial.
You are going to learn how to crochet these beautiful leaves of this sunflower along learning the techniques in order to crochet the flower itself. So, it is a win-win pattern for all. It might be slightly unpleasant that there are two directories for these separate patterns but I doubt that it will be much of an issue.