Just a few things that stand out to me.....
You NAILED the head and neck shape
Looks like your wings are set too low on the body. If you lift them up a little higher the sidepockes should "fit" over the bottom of the wings better.
To get rid of the "stiff leg" look, bend them back at an angle once you attach the bird and then bend the body to the desired position. It ill give it a more natural relaxed look.
His rear end looks a bit thick which gives the body a more elongated shape than needed.
His feet don't look injected or not enough...They should be plump to the point the bones wouldn't be showing once dry.
Again, I agree with everyone else. You are WAY above the curve
When I dry a bird, I first use an air compressor to "fluff" the wet feathers and to disapate the white gas. I then use a hair dryer set on high/hot to finish drying the feathers. You must be careful as to keep the air moving so you don't singe anything . I also make sure to always dry from head to tail along with NOT drying the underside (exposed skin). Once the feathers are 99.9% dry I then put it into my tumbler for 10-15 minutes.(I have never had an issue with the inside skin drying out on waterfowl) I use the tumbler for "preening" and NOT drying. After giving them a good shake to get most of the grit off of them I CAREFULLY use my air compressor again to fluff/remove grit from the belly side before putting it on a manakin. I do NOT blow air on the top side (the back). For me this takes 90% of the grooming away. I am VERY careful to always work forward (from tail to head) so the feathers will stay in place as I wire and work on everything. I also use a bath towel on my workbenh when mounting them to help keep the feathers from being "ruffled" as I work. This saves me TONS of time on the finish up work.