Logic Puzzle #2 - Compact Nurikabe?

Compact Nurikabe?

This is another old puzzle of mine. It's a (somewhat) dense nurikabe with 4 question marks. Hmm..

Rules and link

Shade some cells so that all shaded cells form one orthogonally connected area and no 2x2 region is entirely shaded. Clues cannot be shaded, and every orthogonally connected area of unshaded cells contains exactly one clue, the value of which represents the size of the area. Question marks act as regular clues except that the size of their respective area is unspecified.

You can solve this puzzle here using puzz.link's interface