Thank you for submitting four concepts. #151 and #150 to me have the most potential. #149 and #148 aren't ideal.
Can you please make some revisions to #151 and #150?
Currently, #151 looks like a guillotine and not too much like an open door, like you intended. But I like how your use of black, white, angles and lines to show depth and perspective
Could you work with #151 and invert the colors and perhaps put a knob on the open door? Many some other versions would create something really special?
Regarding #150, I see the steps and door, but that's probably not what people see on first glance. What if the door had a knob and it was open to show a "welcome" feel? How would this look if the colors were inverted? Maybe the open door with a wider black frame would convey my "Everyone Is Welcome!" message.