Photo by Jessie K.
The very large bill, obvious white throat, and the overall dark gray color through the bird give this away as a Seaside Sparrow. It can be a bit confusing in that the supraloral is not bright yellow, but this can be explained by the age of the bird (hatch year bird). The fact that it is a hatch year bird can also be confusing in that this is not a plumage often seen or drawn.
The distinct streaks on the side with a buffy indistinctly streaked front and the over-all grayish tone place this bird in the "atlantic" population.
*For those of you interested this was not taken in NH, and yes, I'm still searching for my NH Seaside Sparrow*