This is written on the skin creation guideline, I don't know if your skin fall under this category?
Promotional Skins
You can't promote like your band, brand, company or basically anything else. It’s pretty straightforward really. So if you feel the need to tell the world about some soda, brand of shoe or maybe a movie. Don’t do it on a PAYDAY weapon skin.

It is barely anything releated to the actual thing you might get anywhere (Only existant usage of that logo is... one T-Shirt made for myself) Logo in its own is not earning money or is not connected to any brand in itself (it does represent me therefore, so depending from the point of view it might be brand if you do consider me as a brand, myself? I do not consider me as a brand)

I might therefore remove it completely from them skins. Even tho I do not consider it as promotion of any brand (as in itself it is not trademarked (what to be honest seems to be the thing here)). So yeah, if more people will actually consider in taking care of making feedback (thank you for that, from experience, I do know people barely can make any good feedback unless they are asked to do so directly) I might make direct logo for the gun as exchange (which just like this one doesn't represent any brand, but then again it is representaton of an artist (just like any art made by anyone, in other words entire workshop is actually promoting things made by the person) it will create the new "brand" for the gun in itself, following this logic, they forbid you to use any logo or make any skin to begin with, even the one newly made for the game).

I will wait for your actual opinion about that (also I will attempt to get some information from Overkill about the issue). So I might make some sticker specially for it.

Thank you again for pointing that out!