Hi - it's cool that you are going to Morocco, I hope you will enjoy it (i'm sure you will)
I'm Moroccan and I don't know really what's a typical Moroccan look like, we have all kind of looks, there's plenty of Asians living in Morocco. We are used to foreign people so to answer your first question, I don't think that's an issue. Casablanca is a big city and as a general rule just be cautious.
concerning the income tax, I'm not sure how much the rate are now, since I'm not living there atm, I'm sure you will get an answer here. if not i will search for you.
If you have any other questions, feel free to ask here, PM me, or email me at
info@gomorocco.com I will be glad to help.
Hope this helps