I started off with 1/35th plastic Tamiya figures and mved up to Verlinden resin 120mm figures about 10 years ago. More recently I've been painting large scale (up to 350m) resin figures. In the past six months, I've experimented with Andrea 54mm and 90mm metal figures, and using Vallejo acylics. The effects are very pleasing and I plan to continue with the smaller scales for the foreseeable future. If nothing else, I can paint 2-3 54mm figures in the time it takes me to do a large scale figure, and I don't get bored. The key to changing scales is to always remeber that contrast increase as the scale decreases. The bigger the figure, the lower the contrast.
Cheers