He practised etching during most of his life , and towards the end he engraved mezzotints .
Aikman 's theme as a painter was landscape , particularly in the Perthshire Highlands and Warwickshire .
Aikman practised etching during most of Aikman 's life , and towards the end he engraved mezzotints .
Aikman 's theme as a painter was landscape , particularly in the Perthshire Highlands and Warwickshire .