As it is, I don't think Creative Artist should be priced more than $3. One can argue that each of the given effects is on their own worth less than $3 (the non-terminal $2 is still strictly worse than silver). I don't think the flexibility is quite enough to warrant its moving from $3 to $4. Note Pawn's ability to choose two makes it in some ways more versatile than this, even if each given choice is less powerful.
The reason why I put it at $4 is because I'm a bit scared that people on a 3/4 opening would just buy two Creative Artists. It's 'as good' as a silver when you have little to no action cards in the beginning and it provides flexibility in the latter stages of the game.
Could it remain priced at $4 if it gave +3 Actions? (The other one's remain as is.)
I don't think it sounds scary at $3. Say you buy two of them in your first two turns. Then you have them both in a hand. The net results of playing them in various combos:
Action/Action=+3 Actions, hand of 3
Action/Card=+1 Action, hand of 5
Action/Buy=+1 Action, +2 Buys
Action/Coin=+1 Action, +$2
Without any additional support, unless you choose actions for the first one, the second is a dead card. There's no serious advantage to buying two on the first two turns, because having the extra actions at that point is not so useful and it is terminal otherwise.
Unless you want to make the pile of Creative Artists more than 10, I would advise against the "gain another Creative Artist" line. It'll pile out very quickly. Cf. Port.
As for Soldier: First, note that there is an official card with this name already, so consider an alternative. Second, and more important, this seems much weaker than Militia for the same cost. The Attack is contingent on you effectively discarding down to 3 cards as well (Play it, have cards left; draw 2, have 6 cards left; discard 3, have 3 cards left) and then puts you at a disadvantage because you cannot play another Action (unless you have played a village previously). I think this needs to be buffed. But I like the contingency of the Attack, so I'd keep that in some fashion.