When using oil pastels for the first time, I think it's important to get the feel for them. It doesn't matter what you draw, it can be just lines. See how they blend, use different strokes and lines, layer colours on top of each other using both lines and block colours. Have fun getting to know them and enjoy seeing the colours come to life. http://bit.ly/2WeKQJ6
You can try various techniques to carefully blend your oil pastels. One of the simplest ways is to use a tissue paper, a cotton ball, a soft cloth, or a q-tip to modify the shades for a much softer look. Using this technique, you can easily blend the colors and produce more artistic effects.