袖口がだんだんと伸びてきて、手が出て、
The sleeve spread out.

とうとう顔も出るように。
Maru’s face was pushed out at last from there.

まる：「実は小顔なのですよ。」
Maru:[In fact, my face is small.]

変な生き物に変わりなし。
After all it is a strange creature.