Indeed, gentleponies, indeed. My first observation was how flat the drawing is. Were this an impression on a coin or medallion, the lack of depth would work perfectly. As such, the piece looks like matte plastic (that sounds much more horrible than it should), though this can be easily fixed by deepening he shadows, and adding a hint of lighter shades where the light is hitting the gentlestallion. It looks as though you intended to give the stallion a more three-dimentional look, though the shading does not add the deeded depth required for this
Actually, this would be fantastic to see on a coin. I would get one. I can see it now...
[Insert Country Gentlecolt here]
"Like a Sir"
In other news, the "glass" affect of the monocle is fantastic, I must say.
The mustache looks unnatural, but then, it is a pony. That said, the detail of the mustache is great, and in all honesty is fine... I have just found mustaches on ponies to look awkward.
In the end, it may not be the most original work of art, but to say that it does not leave a strong impact would be lying.
What impact, you ask? Simple.
Like a sir.