Tattoos and height
Guys can have tatoos on their arms cause their uniform has loong sleeves, girls absolutely not! Not a chance, they also wont allow you to cover it if it is on your wrist!
Crammond I you will be fine, I am sure there is a maximum height for cabin crew (imagine how hard it is to work in such a confined space when being tall -> also, the taller you are the more likely you will suffer from back ache from the constant bending down) but with 1.93 m it is ok, I met many crew who are that tall!