Most of them are only in japanese, but it's not a problem (just need to understand/remember the menus).
I'll list some of them.
Oekaki Puzzle Battle Vol.1 - Yuusha-Oh GaoGaiGar Version easy, and nice game. multiple little picross to make a bigger one. Stylus only.
Simple DS Series Vol. 7 - The Illust Puzzle & Suuji Puzzle (
exists in english) Oekaki in Color ! It's a different strategy than the normal one. 1000 picross. Not the best picross game in gameplay/hint. There's also Sudoku with it
Puzzle series Vol. 6 Illust Logic Good one, very good hints and controls. Stylus and Dpad
DS Puzzler - NumPlay Fan & Oekaki Logic Vertical DS holding. Stylus only, Undo function, colors. I didn't play this one, but don't like it. There's a Sudoku too.
Picross DS (the one you have)
Iraroji VOW Looks nice. Stylus and Dpad, undo function, colors. no "row/column" guide when using stylus (you can go to the cases near other one, but you can undo)
Illust Logic DS + Colorfull Logic Very good one. Good hints, unicolor, multi colors. (I recommend this one)
Simple DS Series Vol. 28 - The Illust Puzzle & Suuji Puzzle 2 same as other "simple DS series"
DS Puzzler - Nanpure Fan & Oekaki Logic - Wi-Fi Taiou Same as NumPlay Fan. (I don't like it)
Color cross Another one in english! a little different than the usual pricross games.
Puzzle Mate DS - Oekaki Mate
Challenge me - Brain Puzzle 1 & 2 : This is the english version of the "Nanpure" series. (the one holding the DS vertically)
Picross 3D You should try it! The 3D is not very hard, and the difficulty is progressive.
There are also homebrew!
NDS-Picross by MeRaMan. I find the hints a little hard to read, and the hints color a little hard to differentiate.
Edit: Ah, this homebrew has been recommended by everyone above