How can I clip the image to a specific polygon?

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You can add a parameter GEOMETRY as in this example:

https://services.sentinel-hub.com/ogc/wms/&lt;INSTANCE_ID&gt;?SERVICE=WMS&amp;REQUEST=GetMap&amp;VERSION=1.3.0&amp;LAYERS=TRUE_COLOR&amp;MAXCC=20&amp;WIDTH=640&amp;HEIGHT=640&amp;CRS=EPSG:4326
&amp;BBOX=-7.885,38.540,-7.870,38.560&amp;
GEOMETRY=POLYGON((
 -7.877244 38.546511,
 -7.876377 38.547818,
 -7.871950 38.546125,
 -7.872611 38.545023,
 -7.871241 38.544475,
 -7.869831 38.544560,
 -7.866011 38.550445,
 -7.872323 38.552895,
 -7.874112 38.551451,
 -7.877110 38.552537,
 -7.878791 38.552976,
 -7.879413 38.553099,
 -7.880600 38.553320,
 -7.881314 38.553126,
 -7.882678 38.552762,
 -7.883951 38.552667,
 -7.885064 38.552160,
 -7.885370 38.549346,
 -7.877244 38.546511))

It is recommended to simplify geometry before passing it as a parameter to avoid exceeding maximum number of characters in URL.

If one wants to have a transparent background outside of the clipped geometry, he can use “FORMAT=image/png” parameter in the call and dataMask band in the evlascript as explained here. Do note however that png images are larger in size and will therefore take longer to load.