3D print doesn't completely seal the surface of the project

Thank you!! I have a question for you, I’m trying to make a couple of things for the grandkids, and the print is leaving holes where the filament isn’t sealing the surface. I have tried a couple of things, but before I start again and waste the filament, I’d like some direction. In your opinion, is the nozzle too hot? Too cold? Is the toolhead too fast? Too slow? I had speeded it up initially, because for heaven’s sake, 3 hours on an articulated shark seems unreasonably long in the print. I slowed it down. Then, I heated up the toolhead because I though maybe it was too hot but i think it got worse. The heat is within the recommended temp of the filament. It was set at 205* Celsius, but I bumped it up to 210 halfway through when I noticed the un-filled areas.