"give your smile"?? I heard "she smiled at him" or "he gave her a smile" or "she gave him her brightest/dumbest/cheekiest etc smile". While there is no grammatical reason not to say "I gave her my smile" (without adjective), it feels absolutely weird and unnatural to me
I'm fairly sure "kah" indicates a question. So you can not use "saya bisakah." as "I can."
You could use it as "saya bisakah?" to ask "can I?" But careful. Bisa = to have the means/strength etc. So it's asking "am I capable of doing this?" (Which is not a very common thing to ask. Usually you know best, wether or not you are able to do sth...)
To ask "can/may I do this?" use "bolehkah?"