Smoothing STL carve

Am wanting to carve a Rocky mountainscape, last time I carved it it came out looking too jagged. I use a 1/18th bull nose bit with a small step over am wondering if I should increase step over and/or reduce Z height. Will be using a 400 X 400 by 45mm birch panel so would like to get it right as the carve will take almost the whole day.

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I’m having the same problem with the edges coming out all rough :weary: and then having to take sand paper to try to smooth it out which then effects the outcome looks