Patience my friend patience!I can see some serious influence of Eboy here, and you've even copied a few small objects. Like that satellite antenna.

It's
NOT ok to rip others artwork!
It's
OK, as long as
you're the artist, and you drew the lines!
Pixelart takes
patience and
practise!
Pixel art is the ability to endure waiting, or provocation without becoming annoyed or upset, or to persevere calmly when faced with difficulties, which you face basically all the time! That's the time when you starting to give up, a true pixel artists spirit is patience!
It's not very hard to see that you've got interest for pixel art!
And BTW, try to erase the black outlines.
Good Luck! Hope you understood my english