I can be constructive, I can also be honest, but according to a recent survey, those who like my posts are thick-skinned
The starting point with any shots that we are able to set up ourselves is:
1. Decide what you want to achieve or show
2. Position the subject
3. Position the camera
4. Arrange the lighting - it simply doesn't work when done in a different order which, with respect, is what you did
General point, my opinion only but if you want to hear it - every shot is taken from far too high a viewpoint, making the subject look unimportant. I won't comment on your bottles pic, I've already given you pointers on that.
Every shot looks unsharp, or unsharp in places anyway, due to lighting errors. With the other shots, you've severely over-lit the white background, this has destroyed the fine edge detail (even on the solid Bronica grip). If you must have a white background, light it evenly and only over-expose just enough to make it look almost white immediately behind the bits that matter, use your camera blinkies to show you the effect. Then, in PS, image>adjustments>Colors: Whites, and move the black slider left until you're happy with the result.
If the image contains whites, just make a rough selection around them first, then select:inverse selection before going into selective color. White backgrounds don't have to look as bad as the ones typically shown on auction sites, we're photographers, we have no excuse for messing it up
And, finally, the lighting on the front subject (the actual subject) needs to be arranged to show the qualities and strengths, just providing the quantity of light needed for the exposure isn't what it's about.
I hope this isn't too harsh, other members are much nicer people
