I'm amazed you haven't got a response to these, they are nice pieces.
Some of the marks here and there are a bit photoshoppy-sloppy (boy's shoulder) but the rhythm of the drawing in the horse is very well realised. The transition between the back of the boy's head and the 'background' needs sorting out though.
You have done well with the harmonics too - that is the play of broad space and subject.
From Gegarin's point of view