My Base Pikachu Artwork card variations article might be useful to look through. It of course also contains a lot of misprints, XY Evolutions cards, and foreign cards, but it should give you the examples and information which you are looking for.
There are all the variations available for the English Base Artwork cards:
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Shadowless 1st edition (Thick Stamp)
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Shadowless non-1st edition
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Regular/shadowed unlimited edition (©1999)
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Regular/shadowed unlimited edition 4th print ©1999-2000
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Shadowless 1st edition Grey Stamp
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Shadowless 1st edition Thin Stamp (very, very rare for non-Holos, but not too hard to find for holos)
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(Base Set 2)
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(XY Evolutions)
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(XY Evolutions Reverse Holo)
Pictures of each can be found in my article.
Greetz,
Quuador