The following three casts turned out fairly successful. The second cast (blue-green one) I left the funnel in while the resin cured which is why there is a circular shaped hole in the part. The third and fourth casts (both pink) I removed the funnel so that the hold by the funnel wouldn't be there, instead there was an extra cylinder of resin attached to the cast. This extra resin was then removed via hand saw and the entire shark cast was sanded down. The third cast turned out the best (i.e. the other fin fully formed and there were no air bubbles on the tip) which was then painted to look like marble.