This sounds obvious, but do make sure you have 6 petals at this point - it is surprising how many times I have carried on happily crocheting only to find I have the wrong number!
On Round 5 you are asked to work a treble crochet (US double crochet) around the post of a marked stitch. This gives the flower shape a really good definition. Use markers to indicate the stitches you need to work around - again, check you have 6!
Once the main part of the flower is complete you can choose whether or not you wish to add in some sewn bullion stitches to the center of the flower:
The leaves are made in 2 stages as the reverse side of the work over the following 2 rounds. The image below shows the stitch you need to work into at the beginning of Round 6:
When working Round 7 you need to find the turning chain at the tip of the leaf made on the previous round:
On Round 7 a chain space is made between the leaves - this is used on the subsequent round to make the base of the small flower buds that sit behind the rose.
I really love the rose motif at this point - it would make such a lovely corsage or fascination don't you think?
Working with the black yarn on the next few rounds can be hard work. If you struggle to see the stitches, avoid working in poor light (in the evening for example). You could try working closer to the window or even get yourself a day light bulb. Working with a light colored sheet on your lap or at a table with a light colored cloth could also help.
I really hope you will enjoy making this motif.