Yea I highly recommend retopologizing it yourself. Automated solutions are always far from ideal, especially in blender. 3Ds Max does a pretty good job and the ZBrush ZRemesher can get some workable topology if you use polygroups.
Just by turning on a couple of already included addons and adding a couple of modifiers (Shrinkwrap and Mirror), you can retopologize pretty quickly in blender.
Base functionality:
Shift + Tab (Turns on snapping. Snap to Face and project individual elements should be selected)
Ctrl+Right Click (extend face from selected edge at mouse cursor)
F (fills in faces of selected vertices)
F (fills a face if 3 edges exist)
F2 addon:
F (creates a face from selected vertex and it’s two neighbouring vertices)
Loop Tools:
This addon provides 3 very useful tools; Space, Relax and Circle.
Space - Spaces selected vertices equally along an edge.
Relax - smooths selected vertices along an edge.
Circle - creates a perfect circle from a continuous edge which runs into itself.
Slide Relax Brush (in Sculpt Brush)
Setting Strength to 0.5 and using it with Shift held down helps to smooth out geometry without reducing volume or changing the basic shape. Great for smoothing out uneven geometry.
I’ll make a video and share it with you. Hang on a sec…