Captain America

I just watch Captain America online. I am wondering on the big and small size captain america. How did they create the effects. The big (the second photo) and small (the first photo) size of captain america are so much different even in the face.

The small and skinny captain seems very ugly. However, after the transformation he looked totally different. Handsome and sexy Chris Evans. 

There is another star got my attention. He is Sebastian Stan and he looked cool with his uniform (the last photos)