Hey Brian,
Yep, some nice work there mate. Well done.
Quite a few others on here too to have a crack at as well.
I suppose this particular challenge is really an exercise in restriction - using just 3 notes in one spot - with the aim of stimulating ideas around phrasing, note selection, bends etc, and ultimately revealing to each individual how much variation can be achieved with just a few notes.
Improv is improv though, and yours was pretty good. 
All the best,
Cheers, Shane