I would join you PJ for Centurion Miniatures, very dynamic youn company producing continuousely resin figures, quarter and half round de bosse, and flats, of all kinds and their site is well documented. They are invading the French , Belgian and some German contests and exhibitoins. They are present with a boot in Many shows since two years, primarley in France. Contact and dispatchiog is very good.
I don't like so much the half-round bosse, with too much relief, but many models are in the two or three formats and they are flexible.
But for a novice, half-round bosse is forgiving more the specificities of a flat due to a strong relief, creating light shadows that should be more painted on a flat, so helping to enter in that world ...
For the anniversary figure, and because it is an anniversary from older time, I would personnaly dream or re-editing (if mould still exist), or re-create by computer perhaps and with Centurion in flat ad half round, the particular "egg" character on a wall in large size issued from Anice in Wonderland, because this book and the work of Mike Taylor are the memory of British BFFS-IFFS.
I cold lead to a internal painting contest for the best and/or most original interpretation of the character.
I have to find out a picture somewhere, and shall post it. There are two others large size, the Lion and

its speaker also in larger size than Mik's serie. This trio would be a re-birth of the BFFS of te years 1900's perhaps. (Size of 60 or 70mm?) [perhaps edited by Werten Miniatures, but where are the moulds today?]
Here are few ideas:
the Jabberwocke, dragon, because mould was broken, can't be recovered, make new mould to please all fans of Teniels
The White Knight, emblematic figure of Alice in Wonderland
The Lion and the Horse in 54mm
The egg, in 54mm???
Perhaps choose among and make a new mould in 60 mm for the anniversary, these are ideas or suggestions...

Now let's other member give their ideas and suggestions....