Welcome !! For a first effort it's not bad at all. I like the parchment texture and the brushes are very nice as well. If I can offer you one bit of feedback it is about your rivers. They all seem plausible but they are very wide. It looks as though you used an eraser brush to "cut" them in. That's a good technique but you could try varying the brush scale to get different size rivers. All in all a very good first effort. Keep up the good work and have some rep.
Kingdom Of Shendenflar Campaign Setting (WIP)
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Even if I am correct, I would still advise you to follow your heart. This whole Cartographers Guild thing, it seems to me, is more about passion and skill and learning new techniques than it is about definitions and rules.
Really nice start, good improvement on the rivers. enjoy
I do like the symbols, but your rivers seem a little implausible in terms of hydrodynamics and gravity fields. How to get your rivers in the right place may be of assistance.