present perfect4

[bayan said]

Dear sir,
Thank you for replying the last time & here are new questions:
1-"I`ve drawn several pictures today,I drew them on drawing-paper"when I asked an english teacher why we used the past simple in the second one but the present perfect in the first one,he said"because when talking about a verb that has been already talked about we use the past simple & because "on drawing-paper"so what did he mean by"because of 'on drawing-paper'"?
2-"we`re engaged to be married,you`re the first people we`ve told -except for my parents-Why is the present perfect used with "told"?
3-I`ve read"we`re happy because you`ll marry our daughter.We give our consent to your engagement.Though we`ve only met you once when you came here for a short time last christmase "why is the present perfect used with"meet"although there`s a specific time (i.e when you came here for a short time).
thanks in advance,
All the best,
Bayan.S

[Tdol]

Having established that the person has completed the drawings, we have set the scene, so, as your teacher says, we now move onto the past to give more details.
2 Because the person is telling them now, so it's important at the time of speaking.
3 I think that some punctuation would make more sense of the sentence:
We give our consent to your engagement, though we`ve only met you once- when you came here for a short time last christmas

[Volcano1985]

1-"I`ve drawn several pictures today,I drew them on drawing-paper"

I think in this sentence the time "today" hasn't finished yet so perfect tense is used there but activity was finished and we know the time "today"

if i did mistake i am sorry...