Two of them are titled after their subject wearing a dark felt hat.
Two paintings originally thought to belong to this series actually depict Alexander Reid, an art dealer from Glasgow. In one of these paintings, the subject casts a diagonal shadow as he stands between two trees, facing the viewer and carrying art supplies under his left arm. Two of them are titled after their subject wearing a dark felt hat. The artist of these paintings often exchanged them with Emile Bernard, who executed similar paintings with these artworks in the background. The last of these, "without beard," was given to the artist's mother as a birthday gift. Another was dedicated to the artist's former roommate Paul Gauguin, and several feature a trademark yellow straw hat. For 10 points, name these paintings, including two with a bandaged ear, depicting the artist of Starry Night.
Two paintings originally thought to belong to this series actually depict Alexander Reid, an art dealer from Glasgow.
{self}-{portraits} by Vincent {van Gogh} [prompt on partial answer]