Drawing and painting formed part of the standard education of any well-brought-up young woman of Susan Bertie's day. She possessed considerable artistic talent, as demonstrated by the fanciful portrait she painted of Banastre at some point during their marriage.

She also painted compositions such as this little watercolor with pressed flowers, dated 1815. I picked this up on Ebay as a lark so the provenance isn't exactly guaranteed. (It is "signed" "Lady Tarleton," but the signature is on the mat, not the painting itself. The handwriting does, however, appear to match Susan's signature on a document in the PRO, so I believe it is genuine.) The vendor told me it was the last of several of her pieces he'd sold. I can only wonder if the any of the other buyers recognized (or were curious about) the identity of "Lady Tarleton."

On the back of the painting, in the same hand, is a snippet of poetry (presumably by popular Irish poet Thomas Moore (1779-1852), though I haven't confirmed it):

The garland I send thee was cull'd from those bow'rs
Where thou and I wander'd in long vanish'd hours
Not a bud or a blossom its bloom here displays
But bears some remembrance of those happy days.
                                       -- Moore