David,
That is very nice for a first attempt, you should be very proud!
As others have said, keep practising, as it does get easier. In my experience, most catches are due to the part of the tool doing the cutting not being vertically above the point of support on the tool rest. Keith Rowley's book covers this in some detail. Once you fully understand this concept, catches will soon become a distant memory.
One other thing, again as others have said, is that in your novice stage, shallower bowls are much less fraught with danger than the deep style that you have gone for.
Well done, and keep up the good work.
Gary