I think to make another color for background "blue" and add shadow "black" for more sensation of depth.

Also, i making "things" for put in all the logo... grass with this colors, a flower, fairs etc... and put a the text in a mountains and down water for the reflect, etc...

I have more ideas for the moment.

"and deffinately add some 3d later on."

For example?

ptoing ,

I know the 90º and 45º lines not have AA, for this i say the aa is more easy XDD.

I not want begin with a hard demoscene logo. I start with easy logo, and i up to skill for make more difficult logos.

When i finish this, i modifi and add more curves o spheres etc..., but first i think is good

Wow 

I like your style, vive colors, simply forms, but in overall is all very nice

I have only a critique.

In the last image, when is the night the shadow of the spaceships "black" is correct, but when is in a fog i thin should be "grey".

I use MS-Paint by for pixel-art is good and for make the graphics pixel-at-pixel you not need more...

But after view all the demoscenes considered pixel-art, i think not all is made pixel-at-pixel and use tricks or short-cuts for make dithering, forms, AA, reflections, etc...

I talk with another amiga pixel-artist, and he said me with deluxe-paint is more easy make pixel-art that with other program (this is their opinion) have the perfect tools to make this, anti-alias, dithering etc... and for demoscene logos not all is make pixet-by-pixel. He make first the line-art and create the bevel. After get a texture decrease colors and retouch the pixels for their line-art and put the anti-alias automatic using the colors(all in grey scale) and for finish change the palete, create details pixel-at-pixel for all the draw etc... and have the demoscene logo.

Now, with this steps i have an idea that how can make the incredibles demoscene logos in pixel-art.

You said all the demoscene logos can made in Ms-Paint(just take longer). I view this, and think he not use Ms-paint jejeje, and think for make this in Ms-Paint is imposible. If you get the image and zoom view imperceptible colors or soften on this. I not think this image its made pixel-at-pixel.

http://gfxzone.org/theme/5_bit/01/peachy-scheryl_lee.png

I view more demoscene logos and all the artists in gfxzone etc.. have a logo... but i looking for a "demoscene tutorial logo" and i not find nothing. I view tutorials of pixel-art that all types... by why no anybody made a demoscene tutorial logo of pixel-art? I think will be interesting...