It sounds like both are examples of too much material being cut away. Either too little space in the shoulders, or just not enough sleeve material.
You could make either example into a tank top. Adding material in is pretty much always going to be really hard and result in a fundamentally different piece of clothing than you started with, rather than a typical alteration where you're removing material.
If they're a way you can remove material to get something you'd be happy with that's definitely the easiest route- like making them into tank tops. Or cutting and hemming the sleves so they're intentionally like half or 3/4 sleeves