Looks good, but in the second one (the vent) the very outermost circle, the one that borders the wall, looks too 2d, maybe adding a roundness to this would fix... otherwise it looks like 'paper' so to speak.

Jimmy died, today, he blew his brains out into the bay, in the state of mind, its my own private suicide. A stitch in time saves nine... what the hell does that mean?!?