Beautiful first bow! Be proud of it, and no worries on the deflex..some just turn out that way. You found the bow within that piece of wood that to most..would have been firewood! I have two very similar to yours..one is my first bow ever made as well ...and it has more than 20,000 arrows through it..all sapwood erc elb. Still a sweet shooter.
The other was a gift to my Father for his 60th bday. I actually named it firewood. Lol. HIs was more like yours. It had twist and a bad split from the start, but is still shooting today. One can learn excellent lessons from tackling difficult wood.
Yes as others have stated, be proud to call this your first bow. Everything from here will be easier for you. From the pictures as far as I can tell you followed the undulations in the back beautifully. NIcely done!