I think your cake looks very nice. I hate 3 leches cakes but not because they are hard to decorate. I hate soggy bread and that's the only thing I taste. Give me bionicos any time.
That being said, I use Pastry Pride all the time for both icing and decorations. Sure you are limited but you can still get a lovely girly cake. When I make 3 leches (and I do all the time) I put my first layer of cake on the board, poke the holes and pour the milk mixture on it to soak. I put the top layer on a cookie sheet and poke holes and only pour half the milk mixture on it. When its ready, I fill the bottom layer and place the top layer on top, poke the top of the cake and pour the remaining milk mixture. I'll let it set up and then ice with Pastry Pride. I don't have any cake falling apart this way. hth