It looks like you are printing with too many perimeter shells…try reducing those down to 3 or 3 shells and you shouldn’t have the gaps in your print. Also, 20-40% infill is a good standard to use
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Re your print - you have too many outer perimeters. I mostly print with 3 outer perimeters. In Slic3r and Simplify3D (and Cura I think from memory) you can just set that as a value. If you can only set your outer shell value as a distance, then you need to know what your extrusion width is in order to calculate what 3 perimeters would be. If your nozzle is 0.4mm (pretty standard) then your extrusion width will probably be somewhere between 0.48mm and 0.68mm. (Note: I disagree with the poster @Craig_7 who says it is 0.4mm) When a layer is deposited the extruded material is slightly squished by the nozzle against the previous layer or bed and also against the adjacent material from a previous extrusion on the same layer. You don’t want it to be 0.4mm because then there would be hardly any material touching the adjacent lines and you can easily get delamination (ie: they won’t stick very well).
For a 0.4mm nozzle, Simplify3D auto sets to 0.48mm width. Slic3r auto sets to 0.68mm width. Both can be overridden to customise. For your little part try 0.9mm-1.0mm as your outer perimeter. Also, you may want to try some other (free) slicers like Slic3r, Cura and also have a look at Repetier (uses Slic3r or Cura engine but good interface). It is very interesting and good experience to learn how different slicers will produce the same part and then you will also learn for tricky parts which software will best make the part.
Lol I have to disagree with poster Davek,.68 for a .4 nozzle is insane. Now just maybe this may have something to do with slicers. On the Ultimaker forum most people use Cura, as do I. The forum is absolute that that if you have say a .4 nozzle you set wall widths to multiples of .4 To do otherwise presents problems to Cura. Maybe it is OK in the slicers Davtek quotes, but not Cura. Oh and in nearly 3 years I have never once suffered delamination, the idea that using wall widths of multiples “easily” leads to delamination is ridiculous.
Now, very recently there has been a discussion on variation of the nozzle size statement (and the wall width correspondingly so it remains a multiple) to improve 1st/top layer performance. I did some testing two weeks ago on this. Setting the nozzle width to .45 gave clearly worse results than leaving it at .4. Very marginal but I am convinced at the moment that setting it at .35 gave a better result than 0.4. What if anything it does to dimensional accuracy (important for engineering, maybe not for figurines) I have not yet tested.