These are tags that suck so give me tips and I'll make a new one that collaborates all of those tips into the signature. Didn't like em, gonna post my better ones only.
I suggest you experiment more with Photoshop. (Filters, Gradients, etc.) Read a guide about each tool and what it does and test them out.
Those are much better then the ones you showed me on msn . In the first one, the light source shouldn't be right on the person. And maybe your background should have more color to it? Overall, they look pretty nice .
Post above is LOTS better, other 2 sigs suck, not to be mean, but in the first one, light is bad placed, and there's no depth. On the 2nd its better, but u need more fonts and better text blending, read a tutorial on that and it'll improve ur work a lot. 4/10.
In all your renders, the images appear warped and misshaped... almost like you haven't used the scaling tool when resizing them? Also try not to isolate the text so often, experiment with placing it over or directly next to your renders. Something else you should watch out for is your use of smudging, of course it can easily be fixed, but the random smudge lines protruding out from your images in all directions look very haphazard...
When you're resizing an image or render hold Shift whilst moving the mouse, the image will stay in proper proportions and not look stretched, that's all the advice I can give, really, cuz they're pretty good apart from that Narnia one you posted. I'd work on the gradients you use, as well, lower the opacity/change the settings and see how it works out, you don't want to make the image one colour etc.