Add "Subdivision Surface" Modifier, divide it to 3 or 4. D'ont apply. Hit Tab-key and make a Petal Shape like this...
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Add a "Bezier Curve". You will use this to curve the Petal. Add an "Curve" Modifier on the Petal an choose the "BezierCurve" as the object, it will act as path. Select the X direction.
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This is what the Petal should look after this operations...
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The middle knob will be a simple sphere scaled to have a flat looking sphere.
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Add an "Solidify" Modifier to the Petal with the thickness set to -0.05. This will give a more polished look to the shapes.
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Now, copy (Shift+D) the Petal and Rotate it to start making a Flower.
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Copy the Petals, rotate and size them a little down. The Flower should look like this for now...
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Switch to "Cylcles Render", and set the world background to "Sky Texture". This will give the whole scene a realistic light. You can even modify the light influence, by moving the spot located on the sphere. It acts as the sunlight... Try a little bit, to see what happens...
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To get more smooth Petals, add another "Subdivision Surface" Modifier to all the Petals. You can do this before you copy the first Petal... (I didn't, so I had to select everyone seperately)
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For the stem, create a cylinder, subdivide it, and proceed as for the Petals, by using a "BezierCurve" to bend it...
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Now for the leaves. Create a cube, and proceed the same as for the Petals : Subdivide, don't apply, shape it as a leave this time.
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Here is my finished leave...
I applied the Subdivide-modifier, and picked some mesh-point, moved them sidewards and forewards, to give it a more leave-like look.
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This is what my Flower looked after all this. For the material now: Simply apply the Glas material (select object, click on "Use node" in the Material-editor). This will do a good job. I prefered to change the refraction-index to 1,8 for my render. Play around with this to see what happens. (Select "Rendered" in the Views instead of "Wireframe" or "Solid", you will get an preview of the materials...)
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And at last, the final render:
(Ok, due to "Cycles Rendering", it can take some time... 2 hours for me. This depends how powerful your PC or Mac is...)