The cancellation by pen (NIGERIA stamp) is definitly not damage, but sign of real postal traffic. The demages of other stamps seems marginal from the photo.
The not washed stamps are also OK. It was discussed on forum. They are used and not damaged.
You are not completely right that Sharjah and Umm al Quiwan are cindarellas. They are real countries, and many of their stamps are listed in catalogues (for example MICHEL). Lot of their stamps were produced mainly for collectors outside of that states, but were generally valid for postage. I´m not sure if this is the case of the stamp in this trade, I do nat have my catalouge with me now.
Nagaland and State of Oman are cindarellas, you are right.
I cannot count the stamps in the trade, but it seems that you are generally very picky collector, so I have one question. What should be rating of your own sendings by your criteria? If 5 stars it is OK.