Interesting how spinning rotors cast stationary shadows...

Really nice, but check the woman's shadow! (Probably wouldn't be much of one with a sky like that...). Holding vote.

Confusing lighting...the sky would seem to indicate the light source is not where the sun is.

Stars don't shine through the moon, and there are inconsistent light sources & perspective issues, but it's a good concept.

Good work.

Could just be a big rock...we can't see if it's floating or not.

Is she a giant, or is that a toy castle?

Author, the purpose of a Step-by-step guide is so you can show how your image was constructed.

Sources are copyrighted. Please see: http://www.pxleyes.com/blog/2009/06/how-and-where-to-find-legal-source-images/ and http://www.pxleyes.com/guidelines/photoshop/

UFOs are renders.

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.

Please fix links 3 & 4.

Nice one!

Interesting idea & good blend. Might be better with a background.

You lost the blemishes, but you also lost most of the skin texture.

There's motion blur on the shuttle itself that tells the eye it's moving down, while the fuel tanks look like they're not moving at all.

Only one piece seems to be moving, and the wrong way, at that...

As I thought, source 3 is a render, and not useable. When using DA for source material, always use this link, which will take you to the stock section. http://www.deviantart.com/browse/all/resources/stockart/ Even then, some images will be renders or premade backgrounds, which are not valid sources. You have plenty of time to find a useable background and revise your entry.

Please fix links 2 and 3. They don't lead to images. The background looks like an illustration and wouldn't be useable in any case.

https://www.youtube.com/watch?v=-VUb_6-XJWQ

Nice, but stars don't show through the moon...

Nicely done...good mood.

Just running an algorithm on an image isn't quite enough.

Agree about the shoulders, hair on her right side doesn't look natural. The edge is basically parallel to the building in background.

You might want to center the image, but that's just me...

Nice work, but what's with the edges?

More of a face exchange than a blend.

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/

I think this version works better.

The light source is almost overhead. I'd make the shadows lower and more to the right. I'd also make the reflection more visible.

Figure needs a reflection, shadows are wrong. Look at the shadow under the chin for original light source.

Not sure I like the torch, but the rest is good.

I think the lenses would still look like those in the source pic.

Rain should be more visible.

Definitely an improvement. (I do like the one with the tail, though).

Inconsistent shadows.

As I said, it's your preference. I thought a long low fin would look cool. Lots of the land speed record cars had fins. https://www.google.com/search?q=world+speed+record+cars&source=lnms&tbm=isch&sa=X&ved=0ahUKEwikhNrvw_3WAhUB5IMKHY56Ag4Q_AUICigB&biw=1724&bih=924
PS: I like the goofy guy in the back seat.

Very cool vehicle. I would have added a tail fin, but that's just my preference. It looks like there's a bit of red stuff to clean up under the rear of the fuselage.

Obviously hiding under the bed.

Good blend & mood over all, but the fish tail doesn't work for me.

Please link directly to your source images. You still need a link to the sky, and probably to the drip, unless you made it.

Owl and background sky are the same values. Makes it hard to see.

Good image...try to match the added shadows to those in the source pic.