For my 15mm Thematic Byzantine army, I wanted to improve on the stiff Essex cavalry pose. Because Essex uses a nice soft casting alloy, I was able to modify figures to suit my needs. The original figure is visible at the lower right of the first image. Modifications included:
1) Large (!!) V-shaped cutout under right shoulder, to allow it to be dropped drastically.
2) Right shoulder finished off by "crushing" the soft metal down further (kind of like forming clay ...).
3) Mail on crushed right shoulder and side pteruges re-detailed.
4) Right forearm re-positioned to accommodate sloped lance pose.
5) Head bent forward at neck, involving cut into back of neck, bending forward, and then pressing down of the pteruges into the gap.
6) Funny looking helmet reworked to resemble spangenhelm, which involved removing the "visor" at the front, and making it more pointy-looking.
7) Added wire lance of desired length (12-foot?).
8) Note that the images below were made prior to filling the slit visible at back of right shoulder, and cleaning up the horse.