There appears to be adequate working space.

Signs are about useless (opinion) since the panel is close to the door, chances are that there wouldn't be anything piled up in front of the panel.

The only other potential problem would be 110.26(C)(1), access to working space is not defined in this particular case & would be a judgement call on the part of the AHJ. I've seen emergency escape doors this size at some coal mine installations (aboveground). State & federal mine inspectors are even tougher than the inspectors we deal with so I'd be inclined to say that the access is adequate.

Tom

Few things are harder to put up with than the annoyance of a good example.