Praise be to Allaah.
If the company allows the rep to buy products for herself
and gives the discount mentioned even when she sells the products to
customers, there is nothing wrong with what you have mentioned. But if the
discount is given only to the rep when she buys for herself, then it is
not permissible for her to pretend to buy for herself in order to get the
discount, because that is deceiving the company and harming it, and it is
not permissible to take the wealth of a Muslim unless he gives it
willingly. What matters here is whether the company knows and gives
permission. If it knows you are ordering products for yourself and you
will give them to your customers, and it still gives you the discount,
then there is nothing wrong with it in that case.
What you have mentioned about covering the images with a
black marker is a good action and it is sufficient in your case.
There is nothing wrong with your selling products from these
countries, because the basic principle is that it is permissible to engage
in trade with the kuffaar, whether they are in a state of war with the
Muslims or are at peace with them.
For more information please see the answer the question no.
And Allah knows best.