A treat for the Lenten season. This is on a bulletin board on one of the churches I visited in Zambales, Pampanga, Philippines for the 'Bisita Iglesia'. Just below the painting is the schedule the church has for the Holy Week.
For the invisible things of Him from the creation of the world are clearly seen, being understood by the things that are made, His eternal power and Godhead;... Rom 1:20
I do not believe it is an imp but rather a boy. He has a water bottle to his lower right from which the water in the cup has been drawn. He is offering Jesus water. A kind act during the Passion. I, obviously, may be wrong, but I feel it is an act of love and respect and not something from the devil as temptation. I also think you did a really good job in capturing so much detail in the script and color in the picture.