This mini is painted with oil, that's why the blending is so "smooth". ( It's an old mini, I'd gave up this technique since many years...bored by the turpentine smell and the inherent brightness)
Lovely banner! As for the figure, the highlights look smooth and the freehand work is well-done. Though I would have drille dout the bolter muzzles more. Also, it'd be nice to have a better view of the right shoulder pad...