Not bad, one thing I would note. When sketching for a client to rough out an idea ... it's not going for perfection more as trying to translate an idea. One thing that I always stressed in my own work was that you are not drawing a (strawberry, pumpkin, horse, albino midget, clown fornicating, etc) you are drawing a representation of that item. When it comes to the sketching phase, try to loosen up and just throw down ideas. This drawing took me 2 minutes and it has all the important parts to it, movement, color, highlights and shows where the process can go. perfection can go with other more refined and later drawings, here you just try to get the idea of how you want it to move.