Please fix link 1.

Great choice for the face! Even though we can see the hat on the page for link 3, your link has to lead to the actual photo used.

Good fix author, and good luck.

Source 6 is a render. The DA author says, "Here is a PNG Of some wildflowers/grass etc on transparent background that I rendered using Poser."
5.6. 3D Renders or Illustrations as Source:
Using other people's 3D renders or illustrations (even with permission and no matter in which form they are offered) creates a false impression of your artwork. So 3D renders or illustrations can not be used as sources, unless they are entirely created by yourself. Only acceptable non-illustration brushes and clip art may be used, but you need to mention them as a source too. Don't use an image that has been altered by the source owner nor an entire work created by someone else.

If you flip the bird horizontally the shadow will be accurate.

Nice color work on the rider. The horse picks up a touch of red reflected from the surface, might want to give her a bit too. Otherwise, good job.

OK links are fine now.

Author, you need to post a link to the original image.

Pretty good! See what it looks like if you add a tiny bit of noise and blur it to simulate skin texture.

Love the dog's transparent paw.

Author, please post links to the house, boat & background sources. If they are all in the same photo, just link to it.

If you fix it in photoshop it should look good anywhere else.

Looks good. Just match the white areas between his ears & shoulders to the background.

Good work & SBS!

Author, somehow I deleted your reply. If you look below the DA image you used, it says "Apophysis and Photoshop." Sometimes DA images can be tricky. The replacement you found works just as well, so good luck!

Source 2 is a render. 5.6. 3D Renders or Illustrations as Source:
Using other people's 3D renders or illustrations (even with permission and no matter in which form they are offered) creates a false impression of your artwork. So 3D renders or illustrations can not be used as sources, unless they are entirely created by yourself. Only acceptable non-illustration brushes and clip art may be used, but you need to mention them as a source too. Don't use an image that has been altered by the source owner nor an entire work created by someone else.

Now you just have to provide links for the new source(s).

Good manipulation. Where's the water that should be showing through the gaps in the vegetation on the right side? (You might want to level the horizon, too...).

I like the eyes & hands! Don't you think there'd be some dirt kicked up by the saucer crash?

Not sure why you'd want to replace the nice sunny sky in the source image. The edges there could use some work, along with the reflections of the heads, but it's a fun image.

Good blend but she doesn't exactly look like she's shouting for help.

Wallpapers are not useable sources. They are mostly copyrighted images, and not offered under Creative Commons licensing.
Please read http://www.pxleyes.com/guidelines/photoshop/
http://www.pxleyes.com/blog/2009/06/how-and-where-to-find-legal-source-images/

Looks like he's hopping backwards on one foot.

Judging from the size of the left hand I'd make the hand holding the light saber bigger. Otherwise this is great.

Good concept & mood.

Congrats, good work.

Author, you should know how it works here by now.

Nice image & great choice of music! The "A" behind the plane & the rest of the type in front is visually confusing, though.

Nice construction!

Good idea but the distortion of the car doesn't work.

If you fix the lens distortion on the background image and make the shadows of the figures conform to the light source, this will work.

Got it. On second view I appreciate this even more; it's very atmospheric.

This is a lovely image. I think the bear is fine the way it is, but I don't understand the woman standing on the bed. Still, I like it.

Your links don't work. You probably put them in the text boxes.

Please post your source links. see http://www.pxleyes.com/courses/guide/guide.pdf and http://www.pxleyes.com/blog/2009/06/how-and-where-to-find-legal-source-images/

Nice job.

A yellow spot on the road from a blue beam?

I know this is nitpicking, but there's no visible light above the truck to account for a shadow, much less such a dark one. We should be able to see the white line & even some of the road texture.

Good image, but give the truck's shadow less opacity.

If you darken the vertical plane this will be more effective. Good idea.

Nicely done.

Fix your links. You probably put them in the text box.

Try to refine the jagged & hard edges on the arms.

3 different light sources, inconsistent shadows.

Author, you're absolutely right, the rule about wallpapers seems to have disappeared from the guidelines. Still, we have to use sources from sites that offer images under creative commons, which wallpaper sites do not. You still have time to find a useable image and resubmit. If you do, work on the lighting & shadows.