Monsters' Menu children's rhyme (CD cover)

Eric James, children's author

The product is a cover for a rhyming tale about monsters and food. The
target audience is children aged 4-9.

Listening to the rhyme will really help you gauge the mood/tone of the
illustrations I'm looking for, so I'd highly recommend doing that
first (it's only 4
mins long) - you can find the full rhyme here:
https://www.youtube.com/watch?v=d8nxeWZzWu4 (turn on annotations to
see the text)

TYPOGRAPHY: The cover must display the text "Monsters' Menu". The text
must be clearly legible, but otherwise you can be as creative as you
like. I'd also like "by Eric James" on the cover in simple, plain
text - if it requires me to purchase a font, please let me know ahead
of time, although I'm trying to avoid any licensing issues so I'd
rather have something bespoke or a font free for commercial use). I
quite like the font I'm using for the YouTube video, which I believe
is also open source, so that may help give you some ideas, and I also
like the idea of green
gradients (although something done little better than I did in the
YouTube video!)

ARTWORK: You can depict monsters if you wish, or you can just stick
with text if you have a particularly good idea for something bespoke.
If you do
wish to draw monsters, I'm guessing they would be something along the
lines of Monsters Inc or the monsters in the images I've uploaded
(these are just to give you general ideas - please don't copy them).

The reason for all this is that I am looking for cover art which I can
use, initially on iTunes, for
the audio book "Monsters' Menu", but there are no book illustrations
yet and I would likely use it for other products related to the story
so if there are limitations, please let me know ahead of time.

While the designs must not be scary (suitable for children aged 4-9)
I'm keen that they shouldn't be overly 'cute' either - the rhyme
should dictate the
imagery used (i.e. think more along the lines of
Monsters Inc than Pokemon). And for obvious reasons please try and
avoid similarities with characters/styles related to well known
monster books or films, such
as Monsters Inc, Gruffalo etc. A few of the initial submissions have
been very bright, happy illustrations, which doesn't reflect the
rhyme
at all, so please to listen to the audio first :)

EDIT: I've had a question about size for non-vector illustrations.
Ideally the bigger the better. If you need a definite size 8.5*8.5
inches with full bleed would be preferred, so I guess that maybe means
8.75*8.75?