Drawing a gnome in Logo
Readability would be greatly enhanced by splitting the code into stanzas, using more line breaks, and adding comments.

Why do you like drawing backwards?  Going forward is much easier to understand.  The first two lines inside the procedure, for example, could be replaced by this code, which draws a counterclockwise path going forward, rather than a clockwise going backward:

to gnome
    ; Outline of conehead
    rt 7
    repeat 180 [fd 1 lt 1/4]
    lt 97
    repeat 180 [fd 1 lt 1/4]
    repeat 180 [fd 1 lt 1]

    pu lt 83 fd 50
    …


There would then be an extra rt 7 command, and it finishes with lt 83 instead of lt 90, but I think that that's a good thing, because it emphasizes that the shape is skewed, not symmetrical.

Some initialization code would be a good idea, to ensure that the turtle is in an expected state.  For example, ht pd would hide the turtle and put the pen down.  You might also want to set the heading and colour as well.

I don't know what dialect of Logo you are using, but setfillcolour instead of setfillcolor seems unusual.