The overall impression is dark, mysterious and more than a little creepy - which, with a title like "clock master," is what I hope you were going for. There definitely a fairy-tale feel to this picture and the less well defined background lends itself well to that. I love the colours and the painted feel to the background especially - it's a great use of texture.
My only real criticism is that I wish the master himself were more defined and didn't blend quite so well into the background. I appreciate the light source is behind him so we will see him in shadow, but perhaps you could play with the levels a little to make him stand out. (Stand out so he's more defined, rather than stand out so much as to look like he's just been cut out and stuck on). For instance, there could be more light on his hand and the raven (I assume), as the light source is behind both of those things and the light would spill to the edges of what we see from this side.... I hope that makes sense.
Overall, I really like this and wouldn't change very much at all. It is though provoking and excellently executed.
I love this. The overall impact of the picture is impressive. I particularly like your use of light and shadow and the glow you have added to the model's body. The texture of the wings and the composition are absolutely stunning. Overall, I'm a little bit in love with this picture.
Now for some constructive criticism - which is just my opinion, so you can choose to ignore it, since overall I think you did and awesome job with this.
The scales on her left, my right, could perhaps do with a little more definition, perhaps with use of light reflection along the tips of the scales? I'm also a little distracted by her hair - specifically, the strands around her face look a but unnatural.. which is fine since this is a fantasy picture and she's clearly not human, but... I wonder whether you could concentrate on the finer detail in this area? There are some great brushes available for PS and GIMP that give you more natural looking hair than just a cut out - as a base, I think the image you used is good. Also the foreground, right in front of her feet where it is particularly dark, doesn't seem to match the crispness of the rest of the picture.. that was more of an after thought though, so take it as you will.