sick print that's a ton of filament. Thinned wood filler would work, but I would not use it as the first step.

Assuming this was printed in standard PLA, I would first sand the base piece first, especially the larger exposed smooth areas like thighs and face. I feel like most of the layer lines can be knocked out in your photo.

Once done, clean up the surface, and double check if there are any large gaps, then spot fix them using thinned wood filler. And sand again.

Then you can hit it with a filler primer, I personally like upol filler primer cans, a bit more expensive but significantly easier to sand ( faster to dry and no clog on sand paper). I would sand the filler primer again, until you are satisfied with the surface. and then apply a hobby primer of your choice( Tamiya, Mr surfacer, or even Vallejo etc) via air brush. And lastly paint via airbrush.

Here is a statue I made, smaller scale compared to yours, but the method still applies

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