Also, the logo should not be too Bogotá-focused...in other words, at some point in the future, I will need "Inglés Lima" and "Inglés Quito" so the logo should be easy to change for these other cities.
We are a language school and there are many in Bogotá. We want to stand out a bit. But I guess we also need to convey that we are a serious and professional company. We target mostly companies and youngish executive professionals (30-45).