Picture is signed "Anders.", that might suggest:

Anders Finer
http://artcity.bitfellas.org/index.php?a=artist&id=2523

the other "Anders" in Artcity database is a photoshopper...

Inspired from original artwork of Sebastian Kruger:

btw: picture by Duffe of Sardonyx.

Featured in "Awkard 2" slideshow by Sardonyx on Amiga
(ed.CONS:link added,thanks)

calling Dr. Freud...

I love this pic! It's so bold and colourful and a nice change from the pseudo-hand painted look that's so popular these days.

Ok, after more check, this logo is more than inspired, some parts seems to have been just copy/past from the original :s

inspired by : http://artcity.bitfellas.org/index.php?a=show&id=996

Look like Antony style
http://artcity.bitfellas.org/index.php?a=artist&id=84&p=1

Nice Miami Vice colour scheme and style.

by Gfx-twins & Sky

since this is their only 40k it should belong to this:
(ed.CONS:link added,thanks!)

From this slideshow
(ed.CONS:link added,thanks!)

...so any atari graphician could have used a kinda 256 colors mode instead of sticking to the 16 ? And its common practice ? I'm learning something today

Yes, and you can also change the palette during the line, it's a common practice on ST,
some gfx tool manage that very well, like Neochrome master http://dhs.nu/files.php?t=single&ID=25

Kurt Kobain
(ed.CONS:link added,thanks!)

I'm totally clueless about what you said, wait, you mean "changing the palette entries for each line" as it is described here ? http://forum.classicamiga.com/forum/showthread.php/4510-Screen-resolution-and-colour-tricks-of-OCS-ECS-games

Agreed, the photo has been imported.

This does not look like it is a redraw to me. More like a photomanipulation.

that is the case. The long time plan is to host the steps aswell. But that is a really long time plan and not priority on the list.