Advice needed.Injury at work

thank you for the responses everyone. . thank you even for the negative ones that doubt if i was doing my job properly.

As someone mentioned above ,i am a human and not a robot and tiredness was a big factor for me at 7am in the morning after a 14.5 hours shift.

i would just like to say that being as there was already people onsite at 7 in the morning , my duties as a security guard end at that time ,as the site is now considered to not be my responsiblity once staff members are onsite.

As for the scar. this is once inch scar in the middle of my forehead. truthfully it is not the worst scar in the world but it has created an uneven skin surface. so it looks worse from certain angles .( Hypertrophic scar )

believe me when i say i do not give a s**t about compensation so do not judge me as one of these people obsessed with compensation culture. i would much rather not have this scar.

As i said before the open window (which was opened at an almost 90 degree angle )was in the middle of a very narrow walkway between 2 buildings.
The height from the ground to the bottom of the window was over 800mm as someone stated earlier. im 5ft 9in so the bottom corner of the window is of a similar height. Also there were no restrictors on the windows as mentioned before.

The only measure that was taken afterwards was that black and yellow plastic sticky tape was taped across one side of the window frame to the other.

anyway i am due to get advice today . thanks for the feedback , i will keep this thread up to date on the matter

despite it looking like its difficult to miss that window in the photo thats not the case , the building on the left ends just parallel to the window so i was cutting into the walkway at a angle, and therefore did not see it ,hope that makes sense.

and for the person who finds this amusing. i hope your never in a situation where you have injured yourself at work.