That's cool. Is interesting you say 'carved'... do you work from a larger piece and take away sand or is more a building up process? The results of your work alway look like you had fun
I build a hollow box and fill it with sand and water then I compact it. When I remove the forms, I have a bix sand block to carve from, I can add as I go with wet sand, but the compacted sand is stronger and holds details.