I wanted to also do My Melody

I'm not going to say it's easy - but it is doable... basically this is how I do it. I get fondant (the flower is gum paste) and make the base color I need (in this case - easy, it's white). I trace out (with a knife) the entire picture in that color.
Then I take the individual elements (ukulele, shirt, & skirt) and trace them out. I make small cuts through the paper and eyeball the rest. The skirt I didn't trace. I just made a bunch of individual leaf fronds and placed them on the base layer.
These get pasted in order with a special glue - meringue powder and water. Just water also works... the glue is also shiny when dry, so at the end I use it everywhere.
The smaller elements are easy, but hard to place (and hard to move... I broke 2-3 whiskers - should have put them on late when she went on the cake).
The flower was more difficult. I traced it out from the picture, then I just did what I felt was "right" - made the cuts toward the center to make petals, shaped it. This was all with the flower around a pencil. Then the stamen I inserted into the pencil hole.
So... 2D is so much easier

the 3D cake I made took far too long.
It's a lot of work, but it's something special I do for some birthdays.
Here's the birdday cake I made for my son's 8th:

It was a lot more work because it's 3D. The walls are brownies.