Thompson's gazelle - Eudorcas thomsonii. Can be easily confused with Grant's gazelle, but in that species the dark black line on the face extends all the way to the base of the horns.
 
Original watercolor painting on archival, 140 lb. cold press paper
Image - 13 1/2 w x21 1/2 h inches. Not matted
 
Shipped flat, protected by an acrylic cover and cardboard. USPS, Priority Mail
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