Based on the OP's changes to the question, I'm going to supersede my own answer. Here's how things would look:
Rocky, barren, with only a handful of lichens, bacteria, and slime molds. You'd be basically turning the clock back 2 billion years to the beginning of cellular life.
The hypothesized flood would be the worst extinction event the planet has experienced, and would wipe out 99.9% of all animal and plant species. Here's why:
Land Plants and Animals: the land would be completely immersed for 40 days. Even water-loving plants (like swamp plants) would not be able to survive 40 days of immersion and lack of sun. And while there are examples of land animals rafting for survival, 40 days is too long to raft without either sinking or dying of starvation.
Fish: adding several thousand feet of fresh water to the oceans would kill most sea fish with desalinzation, and at the same time freshwater fish would largely fail to survive the move to brackish water, and then the collapse of the flood back into continents & oceans.
Larger Marine Animals: while theoretically marine mammals could survive the transition to a giant, world-spanning, low-salt ocean, their food chains would collapse due to the deaths of the fish and they would starve.
Marine Plants: plants that anchor to the bottom would be wiped out due to uprooting, pressure changes, and lack of sunlight. Unanchored plants would mostly be killed by the change from salt water to brackish and then back again, leaving aside that there aren't that many plants that float freely in the open ocean. The only likely survivors here would be algae, invasive water plants like duckweed, and any plants that have ocean-going seeds that can drift for a long time, such as coconut plams, sea hearts, and sea beans.
Sea Birds: while sea birds can survive on the water for long periods of time without coming to land (basically, they do it just to lay eggs), they would starve. Yes, scavenger birds would be able to survive for a while off floating corpses, but the billions of dead animals would sink after a couple of weeks. However, some sea birds are capable of doing without food for long stretches at migration time, so if the Flood's timing was good, these birds might survive. Of course, even when the flood is drained available food would be mostly carrion, so we'd be talking scavenger birds only here.
Polar Animals: per "nothing left to cling to", even the floating glaciers & icebergs would break up into small chunks of ice, unsuitable for habitation, due to the wilder currents of the global ocean. Also, the collapse of the fish population would kill off most polar animals anyway.
Deep Sea Animals: at first, I thought these would be our likely source of life. However, adding several thousand feet of water to the top of the Earth's oceans would increase ocean-bottom pressures to the point that these animals would be largely extinct as well.
So, at "drain the Flood time" you're looking at a globe inhabited with a handful of large plant species, a few lucky fish species, and maybe a species of sea bird or two. And, of course, all of the primitive organisms like algae that are practically speaking, unkillable.
However, we're not done with the catastrophe.
First, billions of dying organisms floating in the world ocean would change the composition of the atmosphere with their decomposition gasses. Given that many of these gasses are unbreathable, greenhouse gasses, or both, this change is likely to be hostile to life until the water and atmosphere clean themselves, something which would take hundreds of thousands, if not millions, of years.
Secondly, let's talk about plate tectonics. Because of the weight of water, ocean plates are both lower and thinner than continental plates. You are hypothesizing at least doubling the weight of the oceans, plus putting an ocean's worth of weight on the continental plates. It's hard to imagine how this would result in anything other than global techtonic collapse, as the ocean plates get pushed into the mantle, melt, the water explodes in steam plumes thousands of miles high, and the whole cycle repeats. It would be similar to hitting the Earth with a meteor the size of the moon; you'd be turning the whole planet to magma and rebuilding the tectonic plates from scratch.
And this is why science and Biblical mythology can't mix ....