check your screen brightness, its probably darker than the normal. I'm seeing a mess in the background where you think is black but it isnt. Overall the image certainly doesnt look like what you see on your screen at all. To see what I mean add a brightness contrast adjustment layer on top of everything, increase the brightness and reduce the contrast.
Hi I will check that out, I just started using Imac's like few weeks ago the screen settings is aslo something I have not touched yet, I will take a look at that and fix the background, thank you so much for your feedback