I use Photoshop and Nikon Color EX. Both are good at making black & white photos.
What techniques are good to keep the photos detailed and give them a lively look?
Photos have been shot during the day.
Photography Stack Exchange is a question and answer site for professional, enthusiast and amateur photographers. It only takes a minute to sign up.Sign up to join this community
In the comments you reveal you're looking for a high key look.
No image processor will do that for you. To get a great high (or low) key image you need a great high(/low) key subject, color and light wise. Besides that you're exposure also needs to be spot on. Not to loose those details.
If these requirements are met you can even get great high key b&w shots with the in camera image processor straight on your flash storage in camera.
I have no idea what your experience is but it might be a good idea to set your Nikon to raw mode (so that you have maximum information) combined with a JPEG file and then select the b&w image preset (from neutral, vivid, default, ...). This way you keep the original raw image to process on a computer. Even in color if you want. While every shot is displayed in camera as a b&w image so you learn to see the light and focus on that only while shooting.