Exposing White / Bright Subjects

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Hi ladies and gentlemen. Want to post this to get a few tips and techniques to get this right.

I've been trying to take pics of subjects such as white flowers and brightly lit things.

Some how it seems that there isnt much detail in my photos even after spot metering on the subject and upping the shutter speed.

here are some examples. The First pic is the raw product

after adjusting the levels, fill lighting and black levels. The second was the result. But it has lost some of the detail...

any help would be great.