Inktense Blocks & GIMP

My truck passed CA smog yesterday.  That's an enormous monkey off my back.  I celebrated with a drive to my "closest" brick 'n mortar art store (30 miles) and unintentionally came home with $100 of art supplies, including a set of Inktense blocks.  I really haven't been thrilled with the Inktense pencils I've had for quite a while. I find them clumsy to sketch with outside the house BUT I've really "clicked" with these sticks with & without wash.  Going down, they feel like I wanted the Prismacolor art stix to feel like.  Right before this sketch, I put down the first line with the art stix -- I got a clear wax line, bleh.  I'm seriously considering taking this set on my trip.

The sketch is Basilica di San Vitale in Ravenna, Italy.  I (finally) downloaded GIMP last week (been meaning to for 2 years).  I tried some smudging in the blue sky to get rid of strokes that the wash didn't smooth enough.