The oil painting looks quite realistic and artistic, I love how you represented the reflection of water. As for the antelopes, I knew they were lions' prey. Generally in the documentaries of both animals you always see the two in nature, face to face.
Lions usually go for easy prey. But if the pride of lions is big and very hungry they will try for something a little bigger. Waterbuck are much bigger than Springbok impala and therefore a nice meal for a large pride.