Yes, I have added litho to a torn area before, with success. However, the smaller the area the trickier it becomes. You could try sticking on very small pieces of litho to cover the torn areas on your card, however due to the tiny sizes in question, you may find it difficult and the end results may not be what you hope for. Matching the exact shapes and sizes will be difficult, as will gluing such small pieces and having them stay in place, and even then you may find a white edge or two remaining after your efforts unless you deliberately overlap your additions over a small area of the un-torn litho. And of course, the additions won't be seamless and will still sit slightly proud of the rest of the card.
However, since this is a restoration project, and assuming of course that any such action (be it the one above or the one which follows) was fully declared if you ever came to sell the card in the future, a far more effective alternative for such a small area of missing litho (assuming you cannot live with it as it is, of course), would be the black pen route. You would need to use a very fine-tipped marker or artist's pen (not a standard felt tip or, god forbid, a biro) and of course be extremely careful to only colour those areas you wish to, however it would certainly work well. Either way (adding litho or black pen), the final item will not be completely original, so the only question which really matters is what do you, as the owner, prefer?
I won't recommend one course of action over another (leave as it is, add litho, or use black pen), as it is your card and your decision. Each method has its advocates and detractors; many collectors revile black pen touch-ups for instance, however since you are the one who has to live with the end results, only you can decide what you should do.
Good luck with the project!
