Hi Sebastian. Thank you for your submissions. (#19, #21, #25, #26) We like the 3D look in #25 and #26.
The font in #25 needs to look much cooler; our preferences should be apparent if you look at our highly rated logos.
The extra "bump" on the top right corner of the Q icon, which we assume is supposed to represent part of a letter C, isn't immediately obvious to us. Also, the entire icon looks very square.
While we like the 3D effects (lighting, reflection) you are using, we'd like to see different concepts for the icon. Please especially keep in mind that we have a lot of logos right now that look like a Q, and not enough other original ideas.