Really not familiar with your camera so it's hard to say. 35mm might be a bit short though - when I can be bothered, I use at least 55mm and normally a longer lens up to 250mm so that I have plenty of room and the light is sufficient far back so that it doesn't overexpose the shot.
If your camera has a mirror lock-up option, you could try that as it will also help to reduce camera shake, even when using a timer.