here are some other images for your reference:
http://habboxwiki.com/wiki/images/e/...di_Machine.gifhttp://habboxwiki.com/wiki/images/c/c5/Bling_fridge.gif
note how bottom part of moodi machine has a lighter edge to give off a more rounded feel and how the fridge has different shades of purple on each of its sides to convey that it isn't just a 2d object. try to incorporate these into your work. right now, you've used what would be termed 'pillow shading' by simply adding a darker shade to all of the edges rather than figuring out where your light is actually coming from. in most 3d works the light source is going to be one of the top corners - in this case i would use the top left. imagine a lamp up there, shining down in the direction your machine is facing. top side of going to be exposed to the most light, so will be the lightest shade of purple. chocolates are not being hit by the light, so that side will be darkest. other will be somewhere in between.