Yes there are alot of errors.
But this is your first time doing photomanip?
And for trying to something ambitious I applaud you.

The only thing that puzzles me is why would aliens visit Liverpool? They wont find intelligent life there!!!

In seriousness though keep at it, check out some guys on youtube to catch some little tips.

Yeah this is my first time and thank you it mean's a lot i have wanted to do photo editing for a long time just never got around to it, And I don't know liverpool just come to mind lol O.o

From the second one, I see the potential in this.

Here are two people that will definitely help you:

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keep watching them, flew has some tutorials so just learn from them.

1st one, is probably not worth trying to fix.

2nd and 3rd ones have potential, but you really need to work on your blending.

Yeah.. That's what am doing on my new edit and thank you!

ySense wrote From the second one, I see the potential in this.

Here are two people that will definitely help you:

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keep watching them, flew has some tutorials so just learn from them.

Those two are really just to marvel at, and hope that one day you get as good as them.. Especially Koshelkov.

You really won't have much of an idea what they're doing if you've just started.

I recommend starting off with Andrei Oprinca, Phlearn, BlueLightningTV, Howard Pinsky, and BakaArts to really learn how to do some neat things, and effects that you can incorporate in your own pieces. As you progress, you can start watching Flew's long ass tutorials and learn how to do some really interesting things. Afterward marvel at Alxander Koshelkov, and William Jansson

Love the second one, just very clean and love the concept of the design

On the back of the plane where it is broke off, maybe try lowering it and make it look like its falling because it looks like you just broke it off and it's flying by itself, very unrealistic

I am a fan of the textures you have used on the plane and maybe for extra, extra detail try using a branded plane, it might just catch the eye.