Well I can't help you with your language as such but I can help you with this thesis. First of all just try rephrasing your first sentence, keep the points, just try structuring it better, it just sounds a bit out of place. For the second sentence, this also sounds a bit off. By saying 'generally considered' i suppose you mean that most people that no about imagology believe he was the founder? Well try saying something more like this.
"The French Scholar Jean-Marie Carre is generally considered the founder of the subject..." then go on to say something like 'but this is debateable' or 'but others believe it was founded by...' yada yada.
For the 3rd sentence, starting with 'At' in reference to a time period sounds a bit odd, so try:
"During the later years of the 1980's.."
Try changing some of the wording of the sentence to. I'd recommend saying:
"During the later years of the 1980's, Imagology began to develop quickly in Europe, especially thanks to the efforts of Daniel-Henri Pageaux and Moha..."
After 'Moha', maybe place a comma and then briefly go into who these 2 people were. Eg.
"...efforts of Daniel Henri Pageaux and Moha, 2 especially gifted academics" or whoever they were, i have no idea lol.
For the next sentence, just the ending sounds wrong. The part '...began to be paid much attention.' doesn't sound right. Try:
"...and imagology research began to recieve far more attention" or something like that.
In the second sentence, of the next paragraph try just getting rid of the 'etc' at the end of 'even notations', or just get rid of 'even notations' and place the etc at the end of 'customs'.
In the following sentence, where it says '..is only narrowed to the study...' maybe try using something different to 'narrowed', like 'only narrowed down to' or 'only praised as the study of another country's image' for that section also sounds wrong. Remove the 'the' between 'of' and 'other'.
For the last section of that sentence i'd recommend removing the 'the' in the part where it says '..such as the images of China in Mark Twain's works, the images of French people...'. Just have:
'...of China in Mark Twain's works, images of French....'
I think that's all that sounded a bit off. These things may seem very insignificant, but they just overall make the thesis sound more natural and polished. Good Luck!