The idea sounds great, but there are some real challenges. How "deep" do you make the water (and therefore how much of the submerged model do you need to see below the surface). How thick will this make the base for the knight? The idea of parts sticking out of murky water sounds great, but you need enough visible to see what it is. Murky water is easy as stated above, simply swirl color into a water effect. The problem is, you need to do it in very thin stages (1/8 thick at most or the water effect may crack, dry in a bowl shape, etc. This will also let you make the murk graduated (more pigment in the bottom layers working to clearer at the top). I had some success with this for an ice feature (frozen pond with things in it). Mine was on a terrain board and I had more than an inch of depth to fill. It took a week of one pour each day.
As noted above, a quicksand/bog is much easier. cut whatever you want to be sticking out, place it inside a shape you want with a lip maybe 1/16 to 1/8" deep (ok, I'm an American, that's 2mm to maybe 5mm at most) then fill it with white glue mixed with whatever color you want. White glue dries mostly clear, but rarely perfectly smooth when in depth, and gives a great muddy/boggy result. For safety you could do it in layers as well. Be warned, it takes days to dry depending on where you are.
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