A great effort, good job. I got 55/100. However some of the picture clues, like the ones for Dhaka, Bogota or Jakarta are very vague. You could use a picture like that from Jakarta and say it's Caracas and no one would notice. A few painted walls from Bogota? Could be Merida or any other Latin America city.
im colombian and i can swear that's not from bogotá, those colorful painted walls are seen more often in antioquia and the coffee axis (quindio, caldas, risaralda)
I know it's a minor detail but the Valletta pic is not actually Valletta. The view is form Valletta to Kalkara... Maltese cities are actually quite strange in that sense. In the same note, the pic of Bangkok is not Bangkok. In fact, quite far. That's Sukhotai.
I got 88/100, and I should've got Beijing but I must've made a typo so it wasn't accepted. Great quiz, more challenging than the featured city quizzes.
Very enjoyable quiz though!