Only if I know who you are and trust you

Why? Literally just scribble on the heads and show that copy?

Next to that, there are also sites on which you can upload any image and they watermark it for you. I don't expect that they will try to illegaly sell your head texture.
Here's one of those: http://www.umarkonline.com/

Just put the pic into paint and drow something on it. like no steal pls

Well if u trust me i guess i could watermark them for u (incase u didnt allready

I can do it.

for future reference, you can make half transparent text/lines in something like photoshop

Yeah I think we can conclude that you can do it yourself too.
If you really need someone else trusted to do it, ask your clan buddies or something, as there are more people here which you aren't as good friends with.

Closing this, feel free to pm me if you like it re-opened with a good reason.

Thanks swosh and fizz for actually answering what I asked. Swosh I'm sending them to you snice I know you

Closing again then.