Does marriage offer have to be different or I can do basic offer like in detail?

I just thought to take her dinner or to eat desert.

After going out of cafe, while walking i think of starting talking stuffs about marriage , and all of a sudden getting on my knee and ask her marry me.

I dont have anything else in mind, and i didn't think of asking her marry in front of people outside, cause i want it to be natural, i dont know how our face exprrssions would be in front of people if i did it, so i want it natural

Is it bad?

Does marriage offer have to be different or I can do basic offer like in detail?
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