here is Irmgard, I hope you are well.
There is no pitfall, when you simple take this rules
and check your photo, before you upload to a Stock.
Avoid legal pitfalls
Most stock photography agencies have strict rules
regarding images of people (if the people in the
photo are recognizable), property (if the image of the
property can lead to its owner, e.g. a license plate on
a car), and trademarked logos or items anywhere in
the image. If in doubt, don't submit such images. If
you want to sell images with recognizable people in
them, all agencies will require you to provide so called
"model releases". A model release is a document with
which the photographed person permits you to sell the
image without need of compensation. Obtaining a
signed model release from ordinary people is next to
impossible, so you might be better off to either weed
those images out or hire professional models.
Key-wording is the key to success, literally
No matter how good your photos are, they won't
sell if no one can find them. All stock sites let
you tag or keyword your images. A good approach
to key wording is to answer six simple questions
for each image: Who? What? Where? When? Why? How?
For example, let's suppose you have a bunch of
nice healthcare related images, shot in a hospital.
Answering "Who?" you might find "doctor", "nurse",
or "patient". Answer "What" to come up with "lancet"
or "stethoscope". Answering "Where" yields "hospital",
"waiting room" or "theatre", while "When" gives
"morning", "afternoon" or any other time of day or year.
Ask yourself "Why" to evoke concepts like "sickness",
"comfort" or "patience". Finally "How" can refer to
the photographic technique involved: It could be
"black and white" or "monochrome", it might be
"blurred" et etcetera.
The last is an important task, as you are searching for
example stock photography, family holidays, beach
or house, in the same way the client search for his need.
Look for the next mail, I will write more to this issue.