Apply Stroke

Illustration with flowers and butterflies in Photoshop

Using the next instrument EllipseTool, create an ellipse with the indicated parameters below:

Illustration with flowers and butterflies in Photoshop

Apply Gradient Overlay:

Illustration with flowers and butterflies in Photoshop

Gradient's parameters:

Illustration with flowers and butterflies in Photoshop

Copy the first group and use Free Transform to make it smaller. Display everything like in the picture, but change first the parameters in the appropriate ones.

Illustration with flowers and butterflies in Photoshop

Gradient Overlay:

Illustration with flowers and butterflies in Photoshop

Gradient's parameters:

Illustration with flowers and butterflies in Photoshop

Displaced
petal's outline
Apply Stroke:

Illustration with flowers and butterflies in Photoshop

Fill 0% on the layers
If everything was done correctly, we'll get:

Illustration with flowers and butterflies in Photoshop

Then copy the already copied first group and displace everything like it is demonstrated in the picture with the parameters' change in the appropriate ones.

Illustration with flowers and butterflies in Photoshop

The flower's petals
Apply Gradient Overlay:

Illustration with flowers and butterflies in Photoshop

Gradient's parameters:

Illustration with flowers and butterflies in Photoshop

Displaced petals' outline
Stroke:

Illustration with flowers and butterflies in Photoshop