The gate itself is foreboding as hell - the pained expressions of its petrified victims, and the red flamelike glow coming off it makes it look like their souls are trapped inside.
It contrasts nicely with the brush and tablet pen you can see through the gate - art tools of past and present, awaiting your long-overdue arrival to a seemingly idyllic paradise.
I quite like the juxtaposition - makes it feel like a trap of sorts. The background helps enhance that feeling, too - the brushwork on the grass/mountains(?) makes it feel like whatever force is animating this "portal" is focusing its efforts on the faux-welcoming brush and pen.
The gate itself helps with this juxtaposition as well, with its cold, stonelike texture contrasting nicely with the chiaroscuro shading coming from inside.