Do not shorten the jacket, it's already quite a bit short, in my opinion. I'll not comment on the shoulder line as the tailor's style is very far from my taste, but bringing them in a bit would suit you better, in my opinion. Btw, the sleeve seems to need some rotating, but those pictures are not very good.
Regarding the trousers, tightening them will not resolve the problem, as your diagnosis is wrong, in my opinion, they suffer from long back balance and no leg opening in this world will solve this problem.
Did your tailor mention some of those alterations?
The jacket length will remain the same. Yes, the shoulder will definitely be brought in and they are not in the so to say final stage. I will post more photos of the shoulders, sleeves and the overall jacket when it fully done for you all to check it out and tell me what you think. As for the trousers, I am not sure I fully understand you but the tailor did mention there will be some alterations to them.