image on vehicle's top

local image
local timer
local duration = 5000
local activeImage = false
local imagesEnabled = true

local images = {
    angry =     "images/angry.png",
    bored =     "images/bored.png",
    ...
}

function drawImageOnVehicleTop(imageFile)
    if activeImage then
        return
    end

    local vehicle = getPedOccupiedVehicle(localPlayer)
    if vehicle then
        image = dxCreateTexture(imageFile)
        if image then
            activeImage = true
            addEventHandler("onClientRender", root, renderImageOnVehicleTop)
            timer = setTimer(destroyImageAndHandlers, duration, 1)
        end
    end
end

function renderImageOnVehicleTop()
    local vehicle = getPedOccupiedVehicle(localPlayer)
    if not isElement(vehicle) or isPedDead(localPlayer) then
        destroyImageAndHandlers()
        return
    end
    local x, y, z = getElementPosition(vehicle)
    dxDrawMaterialLine3D(x, y, z + 2, x, y, z + 1, image, 1)
end

function destroyImageAndHandlers()
    if image then
        destroyElement(image)
        image = nil
        activeImage = false
    end
    if isTimer(timer) then
        killTimer(timer)
    end
    removeEventHandler("onClientRender", root, renderImageOnVehicleTop)
end

local buttons = {
    {key = "1", image = images.angry},
    {key = "2", image = images.bored},
    ...
}

function toggleImages()
    imagesEnabled = not imagesEnabled
    outputChatBox(imagesEnabled and "*" ..greycolor.. " Emoji images has been" ..col_g.. " enabled" or "*" ..greycolor.. " Emoji images has been" ..col_r.. " disabled", 255, 255, 255, true)
end
bindKey( "F6", "down", toggleImages )

function handleKey(button, press)
    if imagesEnabled and press and getKeyState("mouse2") then
        local image = nil

        for i, btn in ipairs(buttons) do
            if button == btn.key then
                image = btn.image
                break
            end
        end

        if image then
            drawImageOnVehicleTop(image)
        end
    end
end
addEventHandler("onClientKey", root, handleKey)