Serge Couvrette wrote:
...comment... so i can evolve, get more creative...

Serge thank you for sharing... this rendering has a delightful "senior portrait" ambiance to it... it's enchantingly charismatic... love how her haunting gaze pulls the viewer in... the soft warm illumination with interplay of light and shadow contrast (Chiaroscuro) works exceptionally well here...

That said, if you are looking to evolve into the commercial side of the equation here are some thoughts in that direction...

While senior portraits are enjoyable and oft can lead to bridal/wedding assignments (if you let the talent know how you would absolutely love to be their wedding photographer). 

Beauty genre may be a wise vertical move...

Analysis?  Your effort here while indeed enchanting falls short on certain aspects of beauty... First you failed to separate this talent's hair from the background... it simply falls off into shadow... a hair light "kicker" to "frame" this talent would have created more drama and likely yielded a more polished aura... Second the wardrobe components are a major distraction... vivid floral patterns are certainly not a complimentary feature to this narrative... you've created dysfunctional colour harmonies... Soft pastels would/could have worked here, but certainly not vivid red, orange and cyan...  Please bring a wardrobe stylist into the mix if your not strong on colour theory... The stylist would have certainly pulled up the necklace so as to better compliment her neck line... The third area of concern is want of a tenured makeup artist on this session... her eyebrows are poorly groomed... and the heavy mascaraed lashes with dark eyeliner are totally out of context from the overall "clean beauty" look... would like to see a hint of white shimmer on her brow-bone to add lift to the eyes... However her nude lip decor is superb... and establishes the clean beauty look here...  In my minds eye, this talent's amazingly gorgeous long flowing golden tresses are her signature... a hair stylist's dream... 

Final thoughts? Please consider collaborating with a hair stylist, makeup artist and wardrobe stylist moving forward... Without a full team you'll not likely reach the next level... Also please consider a tad longer focal length... yes the 50mm is indeed an excellent lens (for full length fashion)...  Beauty genre on a full frame D750 starts at 85mm, 135mm being an industry standard while top commercial shooters will likely use 180mm to 200mm macro primes... it's a matter of how those optics render facial features...   

Hope this helps, or is at least food for thought...
All the best on your journey Serge