They are all really cute.  Love the mermaids and the sailboats.

As for the photography, you could look online for directions on a photo light box, but personally I'd photograph these either outside or at least in a window with the light behind them.  Good luck.

They are all beautiful.  The dog on the snowball is my favourite, but I also love how cute and cuddly those alligators looks in the Noah's Ark piece.

The hole in the top is small and you could easily cover it after with an extra fondant star like the ones on the sides of your cake.

Did you make the marshmallow fondant yourself?  I've been to rushed or lazy to try that yet myself.

Sorry, as I'm in Canada I can't help with a brand name, but most the time I make my own frosting anyway.
I'm jealous of some of the baking items you can get over there whenever I buy my British cake decorating magazines.

I think you should be fine with any creamy butter or vegetable lard based frosting.  The worst thing that might happen is a thin crust on top. 
Stay away from a whipped cream based frosting because it will separate over time if not refrigerated.

I'm so excited! I made my first tiered cake tonight, and it seems fairly successful! I'm still unsure of exactly how to make it super secure (I put dowel rods in, but it's just sitting on top) but as it's not moving anywhere other than MY MOUTH hehe I'm not too worried.

It's a lovely cake, nice job!
Most the time when I make a tiered cake a bit of icing between the bottom cake the the cardboard of the top cake is enough to secure it.  If I'm taking the cake a further distance or if it's top heavy or tall I force a sharpened dowel down the center through both layers and remove it at the location.  You may need to hammer it to get it through the cardboard between the layer.

Love it.
I'm going to have to try one since my DH keeps ripping the left elbow out of all his work shirts and doesn't need them all made into short sleeves.  I have no idea how he does it, but he's ruined 5 so far in a year.

Love the white flowers, I've seen ones like that in tons of wedding magazines.  I'd use those and add pink and grey pearls with the flowers and along a few of the folds.

It's a beautiful painting.  Nice and loose but you can see the detail of the fingers and face also.  Great expression in the face.

He's so cute!  The Meatwad face is perfect also.

Love it!  Great job.