If they are rsm, the black dots will usually be on the bottom (Underside) of the leaves. Then, as they suck sap, the tops of the leaves get yellow/white dots.
doesn't even look that bad to me......spidermites usually show white dots on the top of the leaves......stick a piece of white paper under the leaves and tap them from the top.;....this way the mites will fall on the paper if you have any and then you will know.