[sticklord]

I guess you mean it all works, but the SetPortraitTexture() doesn't add the player to the portrait on first startup? If so it might be because for some reason you can't get the texture at startup. Try to delay the creation abit i.e:

local ADDON_NAME, ns = ...
local f = CreateFrame("Frame")
f:RegisterEvent("ADDON_LOADED")
f:SetScript("OnEvent", function(self, event, ...)
    if (ADDON_NAME == ...) then
        -- Code here
    end
end)

Wait i changed my mind. Use this instead:

local myFrame = CreateFrame("Frame","Frame_Name",UIParent,"ButtonFrameTemplate")
myFrame:SetSize(255,200)
myFrame:ClearAllPoints()
myFrame:SetPoint("LEFT",75,75)
myFrame:EnableMouse(true)
myFrame:SetMovable(true)
myFrame:RegisterForDrag("LeftButton")
myFrame:SetScript("OnDragStart",myFrame.StartMoving)
myFrame:SetScript("OnDragStop",myFrame.StopMovingOrSizing)
myFrame.unit = "player"
 
local img1 = myFrame:CreateTexture(nil, "ARTWORK")
img1:SetHeight(60)
img1:SetWidth(60)
img1:SetPoint("TOPLEFT", -6, 8)
 
myFrame:RegisterEvent("UNIT_PORTRAIT_UPDATE")
myFrame:SetScript('OnEvent', function(self, event, ...)
    if (event == "UNIT_PORTRAIT_UPDATE") then
        local unit = ...
        if (unit == self.unit) then
            SetPortraitTexture(img1, self.unit)
        end
    end
end)