Always use a mask from now on, you’re too beautiful to look at anyway! (Bit cheesy, sorry, but as your steemom I’m allowed to be, right?)
In more seriousness: your arm looks AMAZING! You should be a sharpy/tatoo artist, I’d sign up! But posing with it is a bit awkward, indeed, you want to focus on the arm without looking like you’re posing with the arm :’) It looked most natural in the pic where you are holding your son.
I love the one you picked for the contest - and the second photo is amazing too, I’m so happy to hear your son loves doing photography with you, what a dream for a photographer-mother!