That sketch looks far too busy. Keep it simple to start with. You can always add stuff later.
Anyway, a bog garden? Really?
Your renderings look much more sensible, though I would suggest climbing plants or trained trees on the fences and the walls, especially for that awkward strip between the patio and the far fence. A bed of some sort will be much better than a strip of grass. For the patio, instead of decking, consider coloured paving slabs.
Can you mount a trellis on the back wall of your house? Climbing plants could look wonderful, though you will want to ensure that there's no risk of dry rot from a raised bed beneath.