I took my time and did the change. Now you can just follow
what Mayahuskee and The stone fox said.

Unfortunately, this doesn't work for now because I believe
the mod who used to receive the emails, doesn't do his job
anymore. But, I will change the way it's managed very soon
so that all the mods can see the requests. The option to change the gallery entrance pic will remain the same, though.

Well, as The StoneFox said, except to help... Go to 'Send on
the site' up at the top of the page, next to where you can
edit your profile. When you go there, click down on Fan Art,
and then after clicking the 'Continue' button, and it goes
to the point where you can send fan arts, click on 'Gallery
Options' and then it should say, I think the third or forth
option down, click 'Change my Gallery Entrance Picture'..
click on that, and it will take you to all your pics. It
will ask you to click on one, and then it will pop up a
warning about the picture you clicked on. Click 'Ok' if it
is the picture you want. And then it will say that your
request was sent and a mod will change it ASAP. =]

--Mayaa

yes, when you go to send in a drawing, you click on "My
Gallery Options" then go to "Change my Gallery Entrance
Picture." Then, it will list the pictures in you gallery,
and you select the one you want to be your entrance picture.
Last, it will send the request to a mod, and it will be
changed as soon as possible.