I have seen far worse stuff ;)
The map has it´s flaws.. dull lightning, exept for the quad room (wich is even a little too dark) and the scale is a little off, some places are rather stuffed.
But also nice elements, detailing, mapmodels not overdone and rather intresting layout. You are on the right track :)
It´s not great, but compared to a lot of other "first maps" it shows some talent.

Lightning is rather hard to do in cube, take some time to experiment.
I have bound lots of diffrent lightsouces to my number keys, wich makes it easier and faster. Try to use more small lightsources, rather than just a few big ones, so there´s some contrast left.

I agree with makkE, the outside lighting is bland, but the quad room looks good. It just needs a little more light on the steps. The layout is great, and it has sensibly placed items. It is just a little boxy looking.